First off the reason Moore was traded was because the Rangers wanted to make room for both Matt Cullen and Jarko Immonen to bolster the center position. There was no point having two fourth line centers. Immonen never really took off, mostly due to Renney and the footspeed thing and then the Rangers were left shorthanded.
Second, he would have had a chance in 04-05 if they didn't miss the entire season and at the end of his tenure he was a full-time player so I don't get why he was trashing the team. It wasn't called for.
Third, the players besides Henrik such as Tyutin, Orts, Moore, Hollweg, Betts, Prucha, and even Hossa and to a certain extent Jason Ward all became full-time NHL players with the Rangers so it doesn't matter if Blair Betts played 12 games with Calgary or whatever.
Not everyone plays in the NHL for ten years, injuries happen, skills deteriorate, etc. Rick Vaive and Tony Tanti never really made it out of the 80s. Tomas Kloucek should still be playing if not for injuries. Even Rangers like Mike Allison and Mark Pavelich had a few great seasons and were banged up. For about five years, all of those guys that broke in during the 2005-06 season were solid NHLers and some still would be if not for injuries (Betts-Shoulder, Orts-Blood Clot, Prucha-getting banged up in a small frame....I still think that knee injury before the Olympics really screwed his development up).