He's just saying that even though they get similar results and have similar mindsets, Kawhi is blessed with physical gifts that Winslow isn't blessed with which I can agree with, but Winslow is pretty damn athletic and he's bigger and about as long Wade was when he came into the league (6'10.5 standing reach, 225 lbs of compact muscle, etc) and the dude can jump higher than he seems.
Winslow has a high motor, great stamina and toughness (Mental and physical), and he's very smart.
Hes gonna explode in his 2nd or third year like Butler or Paul George as he gets his offensive confidence. Dude is just trying to learn his role right now but I think he's gonna end up being one of those "We let this motherfukka drop this far in the draft

" in a couple of years when he's gonna be a 20-5-5 player that can play lockdown defense and take over games (He has that "Will my team to win" spirit like Wade too)