How many of the big powerlifters have you seen run, or skate fast?
Like seriously dude, you really think Marner needs to be 280 lbs?
How much time have you spent around competitive powerlifters? Serious question... It sounds like you don't know much about it at all. You do know that they aren't all just the big guys right?
Ever hear about Vladimir Shmondenko? Guy is 172 pounds. His deadlift record is 290kg.
His squat personal record is 210kg.
There are a ton of other STRONG guys, who don't weight much, lifting a ton of weight in their weight category. Marner doesn't need to be big, and slow... just strong, and fast.