People should stop brining up Tacko and Waters as 'part of the roster' when discussing the potential of adding Bane. Those guys are on 2-way contracts - we weren't going to draft an experienced collegiate player in the 1st round and then sign him to a 2-way. It just doesn't happen.
I do agree on Edwards - not sure what the plan is for the guy. With Poirier gone, he is now clearly 15 out 15 on the roster...and possibly 17 out of 15 if Tacko and Waters are outplaying him. He's signed for two more years, too, so I guess we'll roll with him for now until he can be added in an outgoing trade.
As for not drafting Bane - I get it, he looks pretty good; but, unless he turns into a borderline all-star, I don't think it really matters. I remember being bummed that we didn't take Rodney Hood over James Young. Of course Hood turned out to be infinitely better than Young, but who really cares? As a top 5-6 team in the NBA, we have the ability to sign actual good players as FAs. Just this year, we signed Thompson and Teague. Unfortunately, we can't develop an infinite number of players, and who our 13-15 players are certainly won't determine how far we go.