Caio? ...Hmmm.......yeah, I can see that. The only problem I can see is that, if I'm keeping him in character, the last thing he'd do is willingly join any kind of group. I really do need to get his bio finished and posted, but I think I've mentioned before that he's....not a particularly pleasant individual to be around. When Cyril's bio mentioned IPD Command "throwing their other two problems at the 91st", it was in reference to Bell and Caio.
I mean, I could probably make it work, but I'd need a more solid reason for him to be joining the group, because as far as the whole "we're journeying to save the world" thing goes, he would not care in the slightest.