It will be interesting to see the character of this team once the season actually starts. Watson has been preaching defense. I have heard that before. They usually start working hard on D, but as the season progresses they regress to their old practices.
I think the greatest needs will be defense on the perimeter, defense on the interior, and rebounding.
Bledsoe has offensive help now. He can be more of a distributor and defend. He has great defensive abilities and instincts. Bender is the best wing defender the Suns have right now (yes, I said that PJ). But he is not likely going to get minutes ahead of PJ and Warren.
Chandler is a decent interior defender and rim protector, but as his game declines Len's must improve. Len's production is spotty. He has the length and body to defend, but nothing comes instinctively to him. He seems to flip between over-thinking or not thinking. His rebounding can be good, but his mistakes in defensive positioning often leave him out of position for rebounds. Chriss is not a good rebounder either. Alan Williams is the best rebounder on the roster (not named Tyson) but he is hardly starting material.
So. For the future, Bender has to step up. I think he is the future at the 3 over Warren because of his D. Len has to step up or we have to trade him (and other assets) for a premier rim protector rebounder. I would love to see Len forget about scoring and just rebound and defend. An 8 pt, 13 rb, 3 blk stat line would be a thing of beauty.