So, yes, they'll be younger, so they have more energy to travel, but it can't be someone who's merely easily controlled due to being young. After some time being a bishop, and corresponding to the grace of God, he might get "too big for his britches".
No, he'll have to be controllable either because they have the goods on him or because he was an infiltrator to begin with.
Recall the last time that names were being tossed around, and they were among the most Modernist you can find.
I'd fear a Father Paul Robinson, exept that they probably need someone who's multi-lingual. Father Robinson I think speaks a bit of French, but not much else.
I suspect they'd need someone who's at least moderately proficient in French, English, Spanish, and German ... and possibly also Italian given that they'd be in contact with Rome going forward.
Who fits that description?