It isn't rushing anyone (Hagg, Morin, Sanheim, Ghost, #7 pick this year) if they are actually ready to play. The only way it would be a bad thing is if Hakstol/Hextall put a guy out there on a nightly basis who is not ready. That is rushing someone. But if they can play NHL minutes, it isn't rushing them. I sincerely doubt, especially given the excess of defensemen under contract ATM, that the coaches and management are going to force anyone to play if they are not ready.
At the same time, it is not a problem to think that Morin, Hagg, Ghost or even Sanheim might crack the lineup. People around here are obsessed with "patience" when it comes to young players, but at you have a first round selected in the top half of the draft in Morin, now going on three years after his draft year. It is not necessarily a problem if he isn't NHL-ready this year, but it also is not a problem to suggest he might be. Perhaps it may be a little premature to simply assume that Hagg and Ghost are not ready given their lack of first round selection, but Ghost looked like he could play in the NHL last year, and but for his injury, I think he would have been back up toward the end of the season.
I don't like the "he lost a year of development" crap flying around about him. He was in the NHL briefly last year, and again I think we all agree he likely would have been back at the end of the year. Getting injured doesn't all the sudden mean he isn't going to be able to play in the NHL for another year because he has to make up that time. He's a professional athlete. These guys don't simply forget how to play. I'm sure he is and has been involved in some form of training even with the injury, and once camp starts and he gets his legs back, he'll be back where he left off. Guys get hurt all the time. Some more serious than this injury, some less serious. Yes there are guys that don't recover, but there shouldn't be a blanket statement of Ghost not being NHL-ready just because he was injured last year. It absolutely could factor in, but it shouldn't be assumed that it will. Now, if he isn't fully healthy that is a different story, but so long as he is healthy I don't think there is a problem to say he's very much in the mix for a spot in the lineup.