Of not the solos. As Gene said before - Ace didn't really grow as a guitarist.
I have his Frehley's Comet (the 1st one) and I think I only enjoyed 3 songs off that album.
Grow how?
I see Gene as generally being insightful and intelligent, but most of the time when he talks about Peter and Ace he seems to warp the truth top suit his agenda (appeasing fans)
You could say that Eddie Van Halen was innovative but never grew I guess.
Even EVH grew. He was amazing on the debut album but just listen to him play on 1984. One of the finest guitar works in history.