Excellent points.
It wouldn't surprise me if Ainge packages some of the early second round picks to try to move up a few spots, assuming there is someone he likes.
If we keep the Brooklyn pick I feel safe saying that player will be part of the rotation. Stevens seems to be favoring shorter rotations, so I could still see the three players I mentioned making the team. The Brooklyn pick and Ante would most likely be seeing the floor, and depending on depth needs, Yabu and Nader could get a shot at earning minutes too.
I do feel comfortable predicting the Brooklyn pick and Ante as a part of the rotation, even if they are both rookies.
Ainge still had an embarrassment of riches, that's for sure!