The more I think about it, its probably not to bad. His age and Cap hit is nice. so the bruins are gaining cap space along with a very nice player, but what I don't like is the exchanging of the first round picks, Seattle has a 4 game winning streak and the Bruins 4 game losing streak and their tied with the Kraken in the standings, and then your also giving them a 2nd just not sure McCann is worth all that, but in a bad draft year, maybe.
Realistically though I don't see seattle wanting Coyle contract anyways, but coyle and Carlo for McCann isn't to far off (maybe seattle adding a 2nd), so your dealing a 2nd and Lysell and flipping first round picks, not a bad deal if the standings stay as they are come draftday. I guess it'd be a deal that would need to be looked over (maybe twinked a bit)because none of the players the Bruins are dealing will/are difference makers and that number 5 pick could be.