As far as predicted relationships go- here is a good example of why you can't rely on the company for accurate relationship predictions:
My top 5 matches, all known, all well documented, are all listed as 1st cousin. NOT ONE of these 5 individuals are my first cousin. 1 is my mother's fraternal twin sister, one is her older sister, one is my father's sister. In other words, 3 full aunts. 1 is my maternal half brother, and the last is my paternal half sister. These are as immediate of a relationship as I can obtain from living humans. All predicted incorrrectly. But I DONT need to look at their segments to prove a relationship because the amount of shared cM's is what confirms this, not what location on what strands. Really, its more of a hassle to list all 64 segments and their locations on wikitree than anyone has time for.
Why would I bother looking at shared segments for this close of a relationship? To establish general guidelines for every match that is a relationship further removed. Instead of spending months trying to figure out who our MRCA is, using a family tree as our tool, or my favorite, comparimg our ancient ethnicity as a means of how we might be related, a quick glance at location can use the process of elimination or simply refer to known segments to tell you where to look for a probable MRCA. But from the few confirmed DNA relationships I have done on wikitree, if the relationship is 3rd cousin or closer, you do not need to specify what segments you match on, and you do not need to provide the info of any 3rd parties for triangulated proof. They only ask that you provide the shared amount of cM's that confirms or supports the relationship YOU are claiming with your match on THIS SITE, which does not provide you with any algorithms to prove it. If I say my 1/2 sister is my 1/2 sister because ancestry says so, are you going to believe me? Even with the claimed amount of cM's from ancestry, which is different on GEDmatch for every person I've compared with at both sites, BTW, and their reliable relationship prediction of my sister being my 1st cousin? Maybe. The more info I give, the more it helps for you to trust that I know what I'm doing. What if I think I know everything? Like most people in the family tree community? You know, THOSE kind, who tell you that you have an ancestor wrong and demand you adjust your tree immediately, but don't say sorry when you slam them with documents to the contrary and DNA evidence? What if I was a DNA tested "Tree Meddler"? And because I always know everything, tell you that I've confirmed a 2nd cousin relationship on ancestrydna because we share 26cMs? Well, Peter will catch it, and you know that the relationship is either NOT correct based on that small of shared DNA, OR it IS correct, but you got the luck of the DNA dice where the average amount of DNA handed down from parent to child has been tipped to one side a bit more. I am one of those people who just didn't get ANY DNA from a branch of the family! I match nobody fthat is a relationship of 3rd cousin on that line to my mother via DNA...Without my closest relatives all testing, I would have used science to determine that there was a mistake in my tree! In those cases, it's for the sake of the potential cousin match that I would include more info explaining in detail how I decided that relationship was proven. This also goes for posting my known segments. This way, you don't have to contact the distant stranger cousin. Someone has given you a ton of work they did to help YOU not have to do it too, it's a courtesy.
Now. I also have the same set of grandparents on both sides of my tree. Further back, way back, and on dad side, they are 6th or 7th great grands, and on mom's side, 5th greats. When I first got my test results from ancestry, I didn't have them yet in my tree on dad's side, only mom's. The predicted relationship of anyone who matches me at that distance is in the grey area of shared cMs. I cross checked my aunt and sister on dad's side to see if they shared DNA with this match, they didn't, so I was excited to confirm this relationship. Then, my brother and 1c1r showed up, and I made a breakthrough in dad's tree.... turns out, not a maternal match after all. My sister and aunt just didn't get that part of the paternal shared DNA. How would I determine every match from here on out with that set of grandparents? Take it to GEDmatch.
What about the one lady who matches me on ancestry and GEDmatch? Jan? She is a nightmare for me! Ancestry gave me a "hint" that was soooo wrong! They said we shared a set of paternal grandparents, which is true! Gold money! But... no. Wait. She matches my brother and aunt on mom's side! So then, revamp to looking at names. Must be Conway- but then, wait! Mom's first cousin John's test results pop up, and who's on the list? AAAAARGH! Jan! So, not mom's paternal line, but maternal. But WHO? Where? I don't know, nobody does, but if I can figure it out, I'm telling EVERYONE! None of our shared matches are giving up any secrets with their locked profiles and lack of trees either. This is going on almost 2 years! And when I tell everyone, I most certainly will go above and beyond the set requirements for relationship verifications per wikitree' guidelines and put too much info for the next person who has Jan. That algorithm pattern used by my testing company truly outdid itself that time!
All this being said because you CANT just sit back and let the algorithms give you a family. However much money and people and time they put into your report, it isn't PROOF. Had I not have known what little I know, I would be so screwed in my personal perceived knowledge of my matches being confirmation of anything at all if the Big Bang corporate test provider was my only method of deciding who stays and who goes! I also can thank my testing company for teaching me some lessons about how DNA works, because without their many many mistakes, I would have trusted them with their reports.
I'm against the whole "confirmed relationship" via DNA thing on this site anyway. It's not wikitree who is confused, it's everyone who uses the site. It's threads like this that cause one to just say "F*** it" and ignore the DNA button. Simply providing your kit for comparison or letting folks know you tested, add that with a tree is a positive way to avoid the repetition of explaining confirmed relationships and STILL nobody gets it... love this site though, and recommend to everyone!