It is certainly true that you don't necessarily play your best five in the starting line up, but you do usually play your best available player at each position. If Walker, Brown, Tatum, Hayward and Kanter are the starting five that does leave the Celts undersized especially on defense. On the other hand, however, there aren't that many teams that start two really good offensive bigs, and that lineup will be very hard for teams to match up against when the Celts are on offense. I tend to think that this unit will get a chance to show what it can do.