The goal of the Magna Carta project is to develop, review, and approve at least one trail for each Gateway Ancestor documented by Douglas Richardson in Magna Carta Ancestry.
Part of the review process of a developed trail is to select "Confident" for the relationship between parent and child. So a quick check on whether or not the Magna Carta connection that WikiTree finds for you is valid - all the relationships from about 1700 to the Magna Carta Surety Baron should be marked as "Confident".
Some of the trails reviewed/approved by the Magna Cart project before relationship status was an option in WikiTree may show "unknown", but we've been working on re-reviewing those early trails. If your trail shows "unknown" confidence pre-1700 but the profiles have Magna Carta badges, please post an answer below with the WikiTree IDs of the pre-1700 ancestor & the Magna Carta Surety Baron that person connects to so that the project can bump that trail up on the re-review to-do list.
If the pre-1700 profiles in your trail show "unknown" and the profiles are not badged by the Magna Carta project, you might want to consider joining the project, developing that trail, and posting it to Base Camp for review.
If you have any "uncertain" connections, you might want to opt for a different trail and/or different surety baron.
Edit - Please Note: In June 2018, the Magna Carta Project changed its policy on setting relationship confidence. We no longer select "Confident" based on Richardson. See [this page] for details.