Dude, relax. It's been what, one game?, since Despres has been out of the line-up? Having him up here for a couple of weeks, practicing with NHL hockey players and coaches, doing drills against guys like Crosby, Geno and others, is NOT going to hurt his development. Watching a few games from the pressbox is actually beneficial. It's only when a guy isn't playing for 3-4 weeks+ that it becomes a real problem. We are very, very far from that point.
I actually think this part of the "weaning" process can be very beneficial for guys like Despres who is a bubble player for us know, but projects to be a full-time NHLer by next year. Having him up and down a few times is better than having him down all season. And now it's clear: if there's a last minute injury or illness, Despres is the first guy they're going to turn to to play for the team. And as soon as Letang or Martin comes back, he'll be down for sure. There's no problem here. This should only be viewed as a positive, and a positive step in the development and confidence of Despres as a player.