Agreed. It doesn't help that we've lost Bradley but an efficient wing/swing scorer is essential for this team to take another step.
Simmons is one of the few rookies I think will come in and be a good scorer from day 1. I also like your guy Sabonis, his energy would earn him rotation minutes I think. It would depend on who ends up being brought back though. Next year I see Mickey taking some minutes and Amir staying for sure, past that who knows what will happen.
I'm one that doesn't think Ingram will be a hit straight away. You draft him for what he can become in 5 years rather than now. As a rookie I think he'll struggle with the physicality of the league, he'll get worn down quickly. Brown is a player I like but he's not ready to be an efficient scorer. I think he'd mesh well with our team though, he could live off cuts in his first season.
FA is the best place for us to solve this problem though. Durant obviously being the crown piece but also guys like Beal, Barnes, Batum, even Bazemore.. All of them would help us take a step forward.