That Toronto GM is a known crap shooter. That deal for Leonard could backfire if he chooses to go to warm LA instead of cold Toronto.
Nonetheless, the Raptors are showing a better rounded game than the Celtics, who may have more talent. What hurts the Celtics is their overreliance on the 3. Guys who can't shoot the 3 shooting it too much. Not enough going to the paint. And nobody, really, to defend against good big men in the middle.
You take a kid like Williams, who doesn't know defensive rotations well. You plant that kid near the basket and protect the rim. Forget the perimeter. Big men don't shoot 3s anyways, and they are feasting on the Celtics.