Do you think it is possible that after francis' death, a future pope can declare him a heretic and an anti pope, in turn removing him from any spiritual "una cuм" sense of communion with the church? And, for physical good measure the future pope digs up his body and casts it in the river. I think it is possible. And, I believe francis is the pope. In fact, for good measure, I will mention that I don't believe that a council(imperfect or perfect) can depose a pope.
I might be wrong, but I believe Siscoe/Salza explained that JST/Cajetan did not teach that a council
actually deposes the Pope, but rather, that the council would
declare the fact of his deposition.
In other words, the first step is the cardinals announcing to the Church that the Pope has become a heretic.
But then here is the debate: Is a second step required?
Bellarmine says no.
JST/Cajetan say yes.
The second step is actually convening a council to declare the fact of the deposition.
If I have this right, they are saying that the pope has deposed himself by becoming a heretic, but retains jurisdiction until the Church announces the deposition to the world from a council.
Someone might want to double check that, but I think that is the argument.