What we know is this: Lalonde was in charge of the Tampa PK which was great. He mimicked the San Jose Sharks PK run by Boughner.
If Blashill is put in Lalonde's old spot then I would bet that Tampa's penalty kill, which has been above league average since Lalonde joined, will dip to league average or lower.
Tampa will win games by the strength of their roster for sure. But I still stick to the belief that a good coach can take a team and make them 10% better, but a bad coach can make that same team 30% worse.
I don't think Blashill is a great head coach, and I'm certain there are worse guys out there than him, but not many. What I do think is that Blashill is a below average headcoach that got below the expected results out of his Detroit rosters. I think the reason for that is either because he's a terrible strategist and x's and o's guy. Or because he's unable to get players to buy into his system because he's a poor leader and communicator.