Isaiah may or may not be too small to be a starting PG for this team. That's yet to be tested. We still don't know. He plays larger than 5'9" or 5'10", and if his "playing size" is 6'0", well, plenty of good teams have 6'0" starting at PG. But hey, maybe he does just fall...short. Not really viable starting PG material. (Despite him doing a half-decent impression of one for Sacto.) Okay...
I still don't think any of the starting PG options available as draftees, free agents, or trade targets represent a large enough upgrade over settling for Isaiah to be worth the sacrifice in resources, which should all be focused first and foremost on trading up to draft, signing, or trading for a big man. The right star in the frontcourt could make Isaiah look like a Top 10 PG.