The Pope holds the keys of the Kingdom, and sits on the Chair of Peter. Lefebre dared to disobey the Holy Roman Pontiff - chosen in the conclave by the Holy Spirit, through the voting of the Cardinals assembled - because Lefebre was acting French.
You are wrong again. The Pope is not "chosen by the Holy Spirit." That's a fairy tale. Where did you pick up your theology? Did the Holy Spirit choose Pope Alexander who had a mistress that he lived with throughout his papacy? God allows cardinals to make bad choices--even those that turn out to be disasters--just as He will allow foolish councils to deliberate--like Vatican II. As for disobeying a pope--it depends on what is commanded. If what the Pope commands will do harm to souls, he should be disobeyed. All theologians agree with this. This is because the Pope's authority, while great, is still limited by Divine Law.