I want a PF and a Center. The PG-SF depth chart for this club are fine right now and will only get better via draft. I don't see why so many are looking for wings. Just look at the roster depth chart
Guards
IT, All star.
AB, solid two way player.
Smart, solid role player.
Rozier, developing role player.
G/SF
Brown, high pick developing player.
Nader, looking good in DL
SF/PF
Crowder, solid two way player.
Jerekbo, 9th man role player.
Now assume team drafts in the top 5 that's very likely a Guard or SF/PF player. They can easily fill in AB's spot if lost in FA or if he is moved for a big because the team is deep at guard players there. So again no big need for a wing.
Now about upgrading with say Middleton. In a Middleton vs AB, AB is a great on the ball player but off the ball, in the post and in close outs it's true that he gives up a little due to his height. Middleton is pretty much the opposite he has length but isn't as fast so he backs up early. On offense Middleton is pretty much providing the same amount of offense but he can shoot over a lot of guys due to his height while AB is great cutting and running around screens. Not sure how much better the team gets with the change in players. In truth the best case scenario is trade AB for a big and then sign Hayward to play SG upgrading two spots.