I hope the fix how buggy Wyll's scenes are. I'm not surprised putting disguise on him doesn't change his scenes because they are so bugged to begin with. People found that NOT bringing him along to the places he requests, as well as setting up the Spike scene before getting him was the only way to open up his dialogue.
It's a shame too because he's a pretty normal character compared to the others, and I think people would appreciate that.