<Cardinal Sarah's loyalty is to Jesus>
No doubt. But as Prefect for the Congregation of Divine Worship, he serves at the pleasure of the pope.

As for the rest of your post: pure fiction.  You don't know what the pope says in private, what he does, or why.  Why do you make this stuff up?

We do know that the pope suffers from sciatica.  I do, too.  I'm younger than he.  I can still kneel, though getting up and down is painful.  I no longer genuflect.  I suspect that other people in the church, if they even notice that I don't genuflect, don't assume anything about my reasons for not doing so.

You're obviously entitled to your opinions about Pope Francis; but the fact that you disagree with him ought not cause you to dislike him.  Still, you're entitled to dislike him, too; but that ought not cause you to ascribe ulterior motives to him and to write fiction about him.