Thing is, Donovan isn't being coached to crash the boards- we've seen that he can, when he tries, but he has great rebounders under the basket and we want pace, which means being down the floor if possible. Westbrook piled up stats because he was ball dominant and the bigs stepped out of his way, Donovan is still a part-time PG and the team doesn't want him on the glass. He's not ever going to collect a bunch of triple-doubles playing in this system and with these teammates.
We have seen his passing progress, but its been a challenge for him to do without piling on turnovers. That will come and we'll see plenty of double digit assist nights in the future, and I think he'll end up with a better playoff record than Russ.