This is honestly a no brainer for me. If he wanted to go, then let him go. Like others have said, it would likely be different if he was on the NHL roster and playing meaningful minutes there, but playing against the top competition of your peers in a massively competitive tournament, I would suspect that it will be more challenging to play well there vs play well in the AHL. Maybe it's a different kind of competition, not necessarily better or worse, but it's a tournament that these young guys get up for. The AHL and NHL is about the grind and you HOPE you have a healthy enough body to give it your all in the playoffs. Right now, the young players will give it their all. Different type of difficulty, but easy choice to let him go to a top tournament.