I don't see him making the team after his nine-game look, nor do I think it'd be right for his development. That said, should he make the team, I'd like to see him play with Pominville. And I hope he tears it up.
There is a private agreement in place between the NHL and the CHL that governs when a player coming from the CHL can play in the AHL. A player from the CHL has to either turn 20 by December 31st of the season (ie a player born in 1987 can start playing in the 2007-08 season, a player born in 1988 can start playing in the 2008-09 season etc.) OR have completed 4 seasons of junior eligibility. This agreement also covers European players if they are drafted out of the CHL (Examples would be players like Petr Vrana and Ivan Vishnevskiy). Also - CHL players are eligible to play in the AHL once their junior season is over (either by virtue of their team junior not making the playoffs or being eliminated from the playoffs) even if they don't yet meet the age or eligibility criteria listed above.
College players and European players (provided they are drafted out of Europe--even if they later play in the CHL) are not covered by this agreement. They only have to abide by the AHL's age requirement, which is that a player has to turn 18 by September 15 of any given season to be eligible to play. While you won't see many 18-year olds in the AHL, some European players have played at that age (e.g. Niklas Bergfors)
As an aside, there's some belief that this NHL/CHL/AHL may be nearing its end. Many teams dislike having to choose between whether their top prospects have to be rushed to the NHL during their 19/20 season, or be sent back to the CHL where many just dominate--with skill or physicality--but don't necessarily develop their skills as much as they may in the AHL playing against men. Recall Regier stating that it would have been ideal to put Kassian in the AHL in 2010-11 rather than having to send him back to Windsor, where he was at risk for a very long suspension if he had further transgressions. This year, Ryan Strome, Jonathan Huberdeau and several others would be sent back if they don't make their NHL teams. If Grigorenko doesn't make the Sabres in 2013-14, either, back to the QMJHL he goes. It's going to be interesting to see if it's discussed in CBA negotiations.