I think his issues the second half of the year last season were mental moreso than physical.
Quinn did ride Hank for a bit but I really think he started to play like crap when the team lost every close game they were in, started to fall out of the race and the whole mood around the team from like January on was basically resigned to the fact that there'd be another sell off. I think that really took a toll on him, he said as much himself.
I really think Hank is going to be much better this season. I think adding Trouba and Panarin will not only make the team better but it will mentally energize him and maybe when they hit a skid next season that feeling of despair won't be there anymore bc now they have a young solid core instead of vets on their way out.