So, he wil start the season in the AHL anyway?
Maybe. There's a third line spot with pretty solid wingers (Foligno and Stewart at the moment) open and the main contestants seem to be Reinhart, who is less ready than Grigorenko, Larsson, who was just concussed last night, and Torrey Mitchell, who in my opinion shouldn't even be a lock for the 4th line spots being fought for. Just by who appears most ready and deserving of it from camp it should be Grigorenko's spot, but they will surely consider what they think is best for his development as well as Reinhart's. At this point I'm leaning towards thinking he should get the spot, but if he starts out in the AHL getting top minutes that should be just fine for him.
As to the conversation about the mishandling, the most concrete damage done was in burning his ELC. What if he has a strong year in Buffalo and demands to get paid based solely on that, a la Johanssen (without as strong a season obviously), with the more legitimate leverage of the KHL (not that he wants to go there, but neither does RJ yet he's using the leverage, at least Grigorekno is Russian)? It could bite them a bit in that specific situation.
In terms of development I don't think it's harmed him. I did the tallies the other day and he had something like 70+ juniors games and 50+ NHL/AHL games the last two seasons. There were stretches in Buffalo where he was scratched or playing the fourth line but all things considered he got big ice time over a good number of juniors games, got ice and practice time with the pros, and played in two WJC's. I don't think he's been harmed any as he's grown tremendously in his off-puck play, board battles, driving to the net, etc, as well as his physicality which made him more effective in battles and a faster skater. That's not to say he developed this way specifically because of the exact circumstances he developed in, but it's possible, and at any rate it's hard to imagine he'd have developed any better if just left in juniors. That's not to say I don't think they mishandled him, because they did, but I think he's developed pretty much ideally despite that. The other area where he's been harmed, other than burning his ELC, is in perception and value, which shouldn't really matter. Hopefully in a few months he flips that perceptions league-wide, because he's a dedicated and extremely talented young player who deserves to be considered at least as highly as he was on draft day.