matching Lanvallei is unusual, I think, but otherwise - because of all the intermarriages among these prominent families - matching the other 16 Magna Carta Surety Barons (MCSBs) isn't unusual. The trails that the Magna Carta Project works on are lineal - parent/child - so if you were related as a cousin, then cross that one off the list. (I checked my connection to Lanvallei & found an Uncertain along the trail, so I can cross that one off my list! ... Your trail has an Uncertain too, but it's also not a lineal trail - he shows as a cousin, not an nth great-grand.)
I checked your trail to Quincy-266 (one of the sureties that has lots of Gateways) & you're a lineal descendant but have an Uncertain relationship in the trail: https://www.wikitree.com/wiki/Harding-358 ... born England/died Massachusetts, so probably all of your MCSB connections are through him. I looked for Hardy as a Gateway Ancestor in Richardson's Magna Carta Ancestry & there isn't one, so you'll want to check out some of the other paths WikiTree has between you and an MCSB to see if you can find one that doesn't go through Hardy-358. In addition to looking for a lineal trail with no Uncertains, you'll want to look for a trail with a lot of Confidents, and then look at the profiles that are marked as Confident to see if they have the Magna Carta Project Badge - if so, you've likely hit a good trail to develop (even if the profiles don't have the project's badge yet, if Douglas Richardson's work is listed as a source, you're headed in the right direction).
Hope all that made sense. The Magna Carta Project is one of the more involved projects, because the project reviews and approves a profile before it is badged - and the profile must part of a completed trail betweeen an MCSB and a Gateway Ancestor listed by Richardson before the project reviews it (as part of the trail) - it would probably be more accurate to say that the Magna Carta Project reviews/approves trails rather than profiles, although profiles do comprise the trails.
See more about the project on the Magna Carta Project page.