Shark cages have a 50/50 success rate as far as keeping managers from interfering. Enzo was able to squeeze through the bars... James in theory could as well. And he's still able to theoretically toss Carmella a foreign object. Or it's possible they are just putting him in the cage to be funny.
I honestly doubt Asuka will win... I think if they are going to have Carmella drop it, it will be at Summerslam. It's a bigger stage to do a title switch.