Billy's not the first one to say that the worst thing to happen to jazz drumming was Tony. Same thing a lot of cats say about Scotty on bass.
I think you're reading from a perspective of somebody who has a lot of love for Tony, which is cool. But the thing I got from it was that (speaking specifically about Cindy) Cobham thought she was picking up the worst aspects of Tony's playing - volume ( the later records and some of the VSOP stuff he coulda been in a separate room from the rest of the cats) and lack of communication/interactivity - and was being more repertory (basically just playing Tony's shit) than innovative (taking Tony's shit and building on it). Not that I agree or disagree with his assessment, I haven't heard this record.
But what are you saying - that you don't agree with his assessment or he's not allowed to have an opinion if it disagrees with yours?