Unless he blows them away in camp, there's no reason to rush Morin the next two years, he needs 20+ minutes a night in juniors and the AHL more than 8-10 minutes in the NHL.
For one thing, they have 7 veteran defensemen, and 3 prospects in the AHL, so unless you're going to play him 20 minutes, it makes no sense to keep him on the roster this year, and that means trading one of the 6 starters (yes, everyone wants to move Grossman, but easier said than done). And you'd have to move that player in September.
They need to find time for Ghost, Hagg and Alt, much less Morin, which is why I expect them to start at Lehigh and show they're ready.
It's actually a good situation to be in, a solid (maybe not worth the money, but if Grossman's healthy, not a bad 6) defense with 3 solid AHL prospects and two potentially elite junior prospects behind them.