He says that Heatley, like Wade Redden, didn't take conditioning seriously and it ended up catching up with him.
This sounds like something that Redden started when he was in Ottawa and came with him to the Rangers. Conditioning is the first thing that John Tortorella tests in training camp and he takes it very seriously. When you don't take care of your body and at a young age it's hard to catch up when you get older. The slower pace of the AHL may be perfect for where Redden is at now.
As for Heatley, a guy with his kind of talent level should be in the best possible shape. He is wasting his talents by not allowing himself to be the best player he can be.