"And the Wildcat vocals -- which I grew up hearing -- don't create that Mame sound. She sang with what can only be described as more confidence."
Well, yes. Largely because, by the time of MAME, her voice had deteriorated much, much further from its best shape than it had by the time of WILDCAT. If Lucy had somehow been able to use a time machine and play either of those roles in her late twenties or early thirties, I'm pretty sure she would have sounded far better.