If you share what you believe you have discovered, with the full sourcing, I can have a look. Please send me a private message.
Please be aware that the Magna Carta Project does not cover all descendants of the Bigod Surety Barons - only those in verified trails from them to Gateway Ancestors who settled in America before 1700. And its focus ends with the Gateway Ancestor and does not extend to later people.
Michael Cayley, co-Leader, Magna Carta Project