I'm thinking Saul, because that would destroy Robin - and completely annihilate the joy of their reunion.

I think we might get a fake-out where Imu tries to Domi Reversi Loki, and Loki just nopes Imu's ass across Elbaph.
Saul already being down worries me.
Jarul is also a good possibility here. Jarul is old, and Domi Reversi apparently takes lifespan.
Between the army coming to him, and Jarul being possibly Domi Reveri'd... I'm worried about him.
i don't think Imu can control those with the will of D. like Saul and possible Kuma as well( buccaners And Nika relationship somehow hints at the will of D.)
I'd like this a lot, would make sense.
I'm also under the impression that CoC negates Domi Reversi, because Domi is a term referencing dominance or domination, ie, Conqueror's. Dominating a Conqueror should be harder, at the least. Dorry and Brogy CoC incoming? Maybe this is actually foreshadowing Dorry and Brogy becoming Elbaph royalty in the future? Imu making Dorry and Brogy "kings" could be Supreme King foreshadowing, you know D&B will be pissed their Will wasn't strong enough to fight through Imu's magic when Luffy inevitably knocks some sense into them.
I hate watching this happen to Dorry and Brogy, but, on the other hand, I've always wondered what a fight between them and the Straw Hats would look like...
You think there's any chance Jarul has CoC? Unlike Whitebeard, we haven't seen any real injury that would keep him from using his Haki, Jarul seems to be in good health (minus the sword).