The main difference seems to be, that Skal hasn't the speed or the handle to play SF. So Durant is most likely the wrong guy to look at. But still I don't understand why people are so focused on his body weight or his perchieved lack of strength.
His game isn't really built around drawing contact or using strength. It's more or less centered around getting enough seperation to shoot over people. Why should we force him to change that?
Defense and rebounding could be a concern, but let's be honest - which teams will make it their main point of attack to overpower him inside, meaning forcing him to guard 1vs1 in the post in the era of zone and switch it all defense?
Well if I would coach the Kings, I would count myself a happy guy, if a team like GS says "screw that Green+Curry pick&roll we ran again and again, let's post up Green versus this skinny dude and play from there"...
I don't think this is likely to happen. So it all comes down to a few possessions, where he will give up a putback, because his opponent overpowers him and the ref's don't blow their whistle.
Honestly strength and weight is the last thing I would worry about, if I would coach Skal Labissiere (as every professional athlete he will have his nutritionist and follow a conditioning plan, so these things will gradually improve over his career anyways). Developing him to a point, where he can play a pick&roll or pick&pop in his sleep on both ends is the thing, that will make or break his NBA career.
He is a 6'10 kid with a jumpshot and great hops - the potential in the pick&roll is limitless once he develops 3point range and improves his handle to a point, where he can safely put the ball onto the floor once or twice to get to the basket under control.