[ultima ratio]

"But, from what I've heard, a large contingent in Europe is [sedevacantist], and they're driving force behind blocking reconciliation: for they said if it took place on the wrong terms, they would leave."

Apples and oranges. The fact that reconciliation is not desired, does NOT mean these men are sedevacantists. This is a very dangerous time for SSPX. It needs to keep its unity and it needs to weigh its options carefully. Reconcile too soon--before Rome has returned to Catholic Tradition--and the movement could be set back for centuries; reconcile too late--and it risks losing a golden opportunity to help deflect the Church from its modernist course. But none of this has anything to do with the legitimacy of the Pope's claim to the Chair of Peter.