Hi Marian
Welcome to WikiTree! Thanks for all your work!
It looks like Rachel is connected to the world tree now - i'm basing that on the fact that when i click on Global Connections, she has them.
Regarding your other question, about the DNA: The WikiTree DNA links only go for 8 or so degrees of separation. They won't tell you anything about correct ancestry - they just populate out to all the individual profiles that are in range. Edward Rayner, being your 6th g grandfather (8 degrees apart) is at the maximum point of the range from you, so he is on your DNA list but his parents won't be on your DNA list. You still got your DNA from them, it just is quite swirled around by now with all the recombining each generation. If you could test their DNA or any other blood relative that is that much distantly related, you might not show a DNA connection even though you are definitely related - or you might, since it is random. Are you familiar with Blaine Bettinger's chart on the likely amounts of DNA shared at different relationship levels?
Cheers
Shirlea