"Let's start with this: Why has he been so successful in New York? Is it because he tries harder there, that he fits in better there, that he learned his lesson in Dallas and is a new man now? Or is it simply (as so many Rangers fans will tell you) that they know how to handle him and the Stars did not?"
Heika also takes Dallas to task...
"If you don't feel the structured system is best, can you ask why the Stars weren't able to adapt to Avery? He obviously has talent. He can skate, he can agitate, he can score goals. When you watch him now and see what his high-end potential is, do you cut Brett Hull a little more slack for liking what he saw? Could Avery have been the final piece if the team was healthy or was it simply the wrong player at the wrong time? (I still believe it was the wrong player, but it sure doesn't look as foolish now that you see what the guy can do when he's on his game)."
...the reason Avery didn't work well in Dallas was because his teammates didn't have his back. From day one the Dallas players were lukewarm towards him at best. Why would any player want to go to war with teammates that won't be there for him?
...the other reason was the guy loves playing in New York and feeds off the energy in the Garden. I'm sure playing in Dallas, a non-traditional hockey city, was a letdown.