I guess I'm more or less in the same boat as
@aufheben in the sense that I see a player that is probably too good for the AHL. So in that sense, I'm not really sure what he'd do there other than put up a 3-5 points in the 2-4 games and then come right back up here and still have to work on the same things.
In some cases, I think a trip to the AHL can be beneficial. In other cases, I wonder if it becomes a bit of a default response when a young player is going through rough patches. Kind of like a wounded animal, we don't want them to suffer, so we figure sending them to a place where they can dominate will help. But sometimes a young player just needs to accept the challenge and needs to experience just how difficult the NHL can be.
In Kakko's case, I think he has more to learn fighting for his points in the NHL than he does racking up the points in the AHL.