I wasn't sure where to put this but I think Ainge has positioned us very nicely for the draft in terms of roster spots. Here is what I think the returning roster will look like along with potential open "slots" for rookies:
PG
Smart, Thomas, ROOKIE (assumes Pressey is cut)
SG
Bradley, Young, ROOKIE (assumes Babb is cut)
SF
Crowder (assumes comes back), Wallace, ROOKIE
PF
Sullinger, Jerebko (assumes he comes back), ROOKIE
C
Zeller, Olynyk, ROOKIE
I know you could squabble over whether Olynyk is a C or a PF but the main point is that this roster allows us to draft the best player available at any position, at least with the first couple of picks. I don't think this is going to be a great team next year if all we add are rookies but at least it will be a functional roster.
In looking at all of the mocks, it seems like the second half of the first round, very early second round, where we have 3 picks, is being projected to have a number of PFs/Bigs available. We could take 2 or even 3 bigs (assume Jerebko then doesn't come back) and still have a balanced roster. Or if there is another player at a different position that looks good, no problem.
I don't think any rookie we pick this year is going to be in the rotation. We kind of have 3 first round picks so all we can hope for is that we get lucky with one of them that develops way beyond expectation or at least plays well enough for us to have the flexibility to trade someone like Sullinger or Bradley in a package that get us something better.
The point is that we have the roster flexibility to bring these rookies in and give them all a chance.