Amir, Lee, Zeller,
Kelly, Sully, Mickey, Jonas
Crowder, Turner, Holmes
Bradley, Hunter, Young,
Smart, Thomas, Rozier
I would make calls about Turner, Young, and Jonas in that order, at this point I would take Two second rounders in the late 30's for Young. Not sure we could get that though.
Jonas can't be traded until January. That won't work for keeping Holmes. Also, Stevens doesn't think of 5 positions, he thinks of four:
Bigs: Lee, Johnson, Zeller, Sullinger, Olynyk, Mickey
Swings: Crowder, Jerebko, (Holmes)
Wings: Bradley, Hunter, Young
Ball handlers: Thomas, Smart, Rozier, Turner
With four positions, each lineup will have at least two of one of those groups. He would like to play lineups with two swings, but really can't with the current roster. Look for any of Sully, Olynyk, Mickey, and Zeller to be traded for a swing, ideally a 2-for-1, and Holmes also signed. A ball handler also could go, but bigs are where the major logjam is. Trading a wing like Young is a little trickier, although a) he'll have trouble cracking to rotation, and b) Turner and Smart can both play that role, so it's not as big a worry if that gets the deal done. But trading Jonas is the exact opposite of what makes sense for the roster, and again, is not permitted until January.