Not really sure if attempting to compare MCW's lack of strength with Durant's success is on the same plane. Durant at 6'10" or 11" has a very unique skillset, and can really shoot the ball. MCW has an average handle at best, and really can't shoot it well, certainly he hasn't proven to do it with any sort of consistency. Combine that with his weak build...ultimately, we'll have to wait and see.
Durant's lack of strength was a serious factor in the Grizzlies series. No doubt he's a special talent, but with Westbrook out, he did not have the strength nor stamina to carry his team into the next round. Certainly, imo, his weaker frame contributed to him missing that mid-range open look at the end of last night's game. Several critics said he should've driven or gotten closer to the rim, but his relative lack of strength likely convinced him otherwise. In my opinion, Durant needs to work on his strength...