For those who defend the new position of making a practical agreement before a doctrinal agreement, ask them this question: "If the next Superior General were to admit that it was imprudent to make a practical agreement first and that the SSPX will now go back to the previous position of doctrine first, then would you, as an SSPX supporter, agree with the new Superior General and admit the previous S.G. was imprudent or will you now admit the new S.G. is wrong and he should have continued the policy of the previous S.G.?"
I know someone who ask this question to strong supporter of Bishop Fellay's current position, and he did not get a response to this question.
That is because they are following persons rather than principles and that is a very, very, very dangerous game to play.