I'm a big believer in Greig, but in no way has he proven he's too good for the AHL. AHL wasn't an option last year, so they had to choose between NHL and CHL and if they chose CHL it was a final decision, no calling him up. Had AHL been an option, he'd might have gone there and gotten some callups.
The reality is he's not even destroying the CHL; although a very good player in that league he was not even too good for that league little lone the AHL, I don't see how on earth you can think he's too good for the AHL, so many better prospects than him have spent time in the AHL, it's a good league, very few players are too good for it at 19-20 yrs old.