Neither Supersax, nor Ra, nor Walter Davis, nor Quinichette sound exactly like the spirits they may or may not have been chanelling. With the first two, that's sort of a given, but I bought that Walter Davis thing after hearing about it, and, no, he doesn't sound like Monk. I can hear the spirit (and hard), but the voice is still his. Quinichette? Hey, there's been any number of times where he's almost fooled me, but the key word there is almost. Sooner or later, it becomes apparent who it is, and it ain't Pres.
Now, on this Wilbur thing, it was obvious that it wasn't Hawk, but it was also obvious that the players were going beyond a simple "chanelling". This was an intentional, conscious attempt, probably even a premeditated one, to speak in somebody else's voice. Nothing spontaneous or mystical about it. An ensemble re-creation of Hawk's playing, a la Supersax, would be one thing, but to hear a sequence of solos so blatantly imitative (and in a pretty detailed, intimate way at that) is another. And irony of ironies - is Allen the one guy who's not sucking on the Hawk tip?
The bottom line in all this for me is this - are you receiving a spirit, or are you taking it? Big, big difference...