If westbrook ever learns to shoot the jumper, he's going to be the bigger version of iverson. 
If durrant ever learns to post, he's going to be the better version of dirk.
I don't think Westbrook and AI are much comparable, perhaps only similarities are their shoot first mentality and the fact that they both play the point although I've always said both play (have played for AI) outta position.
Westbrook is already much bigger physically and stronger at 23 than AI ever was in his prime, also much athletic while his handle can't be compared to AI, on the upside his vision and passing can improve along with his jumper.
Westbrook is already arguably the most athletic point guard to ever play in the NBA, closest might be Derrick Rose although I'm sure his torn ACL will hamper that this coming season.
Durant him is already a much better all around player than Dirk at only 23.
Though I agree that his post game needs variety, his main concern this off season should be his physicality: the boy needs to put on some mad muscle as he was clearly outmuscled in the Finals.
His defense is already much superior to what Dirk ever brought at his best though his rebounding also has room to improve but overall Durant is already a much better player than Dirk and this isn't breaking news.
