Rollins and KPJ are pretty close to untouchable, IMO. Not that they are all-world players, but they are young, cheap, improving, and good on offense and defense.
GTJ and Green at the 2 is "ok", but could be improved. Both players at 3 gets overwhelmed by size. We do have a future first round pick to deal with... but more importantly, we have cap room to take on a salary dump (Bucks are 25th in the league right now). Cleveland is over both aprons. Timberwolves are over the first apron... Maybe one of the teams at the high end would want to move a bit lower?
Not looking for the second coming of Khris, but a strong defender with a bit of size that isn't a total black hole on offense.
As for the Wizards game... I think you need to ask Turner how the opposing C got 6 offensive rebounds while he only had 3 total rebounds. He has never been a big rebound guy, but he has to wake up and see that Sims is mainly getting playing time because he won't rebound.
Of course, Justin Champagnie also grabbed 6 OREBs which goes to my point about our SFs being outsized. Maybe it is time for AJJ to get a chance?