You're ASSuming the other 2 are available
Which I'm ASSuming is the reason Harden wanted out
He was being played top 5 in MPG while KD and Rie were unavailable for large chunks of the last 2 seasons

The Emo Trio may not play together for awhile
...and there will absolutely be games where he's going to have to be an offensive option to get Ws...
With Rie, KD or both out of the lineup

and then there's the playoffs

I agree, his intangibles fit BKN well
...but his liabilities are also still there...