Morin got a cheap 3 year deal coming off a knee injury that would cause him to miss at least 1 season. He had not even close to established himself as an NHLer, with all of 3 games played. I don't even think I'd call that a "prove it" deal -- it was his actual value. Best case he might've cost himself a few hundred thousand in year 3.
Meanwhile, Nolan Patrick is an established NHL 3C. Migraine disorders are no joke, but it's not overly optimistic to think it can be manageable from here on out. It's unique and not comparable to an ACL tear. His floor is a 3C. His "prove it" deal would be moving forwards in his projections. I see no reason he locks himself into multiple cheap years. Unlike Morin, he banked an NHL salary on his ELC. I don't know what that 1 year cost would be......1.5 mil? But we could be talking millions lost by year 2, if he's healthy.