You can make the case that Isaiah Thomas is the best point guard on the current Celtics. Thomas has made no secret of the fact that he would like to start. The problem is that he makes an almost perfect backup guard and presents distinct liabilities as a starter.
If Isaiah buys in to the 6th man energy burst that is a Celtics tradition and which Ainge has tried hard to sell, he is an exquisite asset. If, however, he chafes in this backup role, he is a problem waiting to happen. How this plays out may play a significant part in the developmental path of this team.