Harden will make more than 15 next year, and klay will not get 17.5 till next year.
Harden wont average 26,5,5 and klay is a better 2 way player.
Harden's negative defense player actually gives opp free point so he be like 26-8= 18 about his actually net gain for his team winning points.
Well klay is definitely a positive defender so his actually influence on point will be like 18+4 = 22. Better than Harden easily.
He plays off ball which is great because there are so many on ball max player in the league wing player wise. There are easily more teams need a player like Clay than Harden. For example:
For spurs Clay replace Danny Green will make spurs a better team easily better than Harden.
For Thunder Clay replace who ever play Sg will be better than Harden.
For Clipper Clay replace JJ is better than Harden.
For Cavs Clay replace waiter is better than Harden.
For bulls Clay....
you get the point now? so many max star play on ball on all top contender makes clay's off ball and D so valuable esp. in the play off. Well Harden's chucking, iso, dribbling ball hog does not mesh well with any top contender.
There fore he is better and cheaper.