[@OtomostheCrazy] seems like he would be a detriment to the party given that he would need a babysitter. 
Does his illusions benefit the teams combat/escape mechanics and thus make him a crucial member? Given that Kaathe can do better illusions it stands to ask why we would need a weaker version.

Sell the idea here mate. What's this guy excel at. How does he use his gifts?