My thought was when I watched the vid that I can sort of understand why Gene and Paul think he is a live show liability these days (and has been for a while). And I'm not talking about slimming pills (he seems to take rather casually, never mind the side effects) or a few extra pounds and all that (his skin was always bad with those acne scars), but just simply: "Would this man be focused enough to entertain a smaller arena of say, a couple of thousands of people, for two hours in a physically demanding stage show on a lengthy tour with four to five shows a week?"
I know, dear Kiss Army grunts, sacrilege ...
I saw Ace relatively recently in a small club and it was a good show, but of course it had nothing of the type of demands the Kiss live spectacle would put on him. There is a reason why Paul Stanley had to get a new hip.