I wouldn't trade Durant, def not Booker, yet. I would look to try and trade for someone like Caruso, or any kind of defensive leader at the point guard. Someone who doesn't need the ball on offense, but can handle it a bit, but on defense is a huge asset. This will change the way this team can play. I would swap Grayson Allen for Caruso in a second, but I don't see why the Bulls would do that. We need players that can defend and would move off the ball on offense. Booker is fine as a closing PG, I really think despite the issues it can work.
The main issue I see is we're 20th in the league on defense. You won't get defense with Booker, Allen, Gordon (Or even Beal in there) style lineups. You need someone like Goodwin, who can stop the ball. Goodwin though just isn't a starting caliber player. So we need to trade for one.
If the Suns can build a top 10 defense, they will contend with Book/Durant. Book/Durant are enough on offense. It's just our defense is really isn't any good, most of the time.