Conclusions based on random plays tend to be incorrect: many, many times (with Rubio) we grab a rebound, Donovan or Joe is the first to get the ball and attacks the rim at will if the defense is not set. Heck, even Crowder does it at times.
Passing it to Rubio first is not a requirement at all. In fact, many other times even when the defense is set and we have to run a half-court play Don or Joe runs the play and Rubio doesn't even touch the ball. That's Quin's system. Multiple ball handlers, multiple guys running plays at different times.