The Celtics aren't deep enough to draft "the best athlete available" IMO. Besides, that hasn't worked out too well in the past. I think the Celtics will draft a Guard. A SG unless Danny has strong plans to jettison Rondo.
I don't see any centers that can step in or who are significantly better prospet than Melo. We have a suitable PF in Sully and I see the Celtics getting either a PF and/or C via trade and/or FA.
Assuming that McLemore, Trey Burke, Muhammed, Oladipo and McCollum are gone in the first 15...
I see the Celtics will pick in order of priority:
1. Carter-Williams (6'6" SG with PG skills) from Syracuse 2. Snell (6'7" SG) solid all around game and replaces Bradley as a starter mid season 3. Caldwell-Pope (6'5" SG - GA) great scorer and good defender
If Danny had the balls and smarts of BB, he would trade out of the first round (#16 for Cleveland 31 and 33 or Philly 35 and 42 or even Portland's 39 and 40?) and maybe get one of those three AND - Allan Crabbe, Franlklin, Hardaway, Goodwin, Paul, Schroeder (PG) and my favorite - Ledo, 6'7" SG from Providence a facinating high-risk huge-reward pick.
Hoping Danny gets rid of Terry, Crawford, and Williams and brings in any two of the above - preferably Carter-Williams and Ledo (assuming we trade to get a second pick).