Ainge won't trade the Brooklyn picks, which is why they can't make a deal, he has nothing else of significant value.
Bradley for Covington would make sense, not Bradley and a late round 1st for Jah/Noel.
Bradley didn't break out until his 6th season, so he is what he is, a decent starting guard but nothing special, and not a starter on a playoff team. While he improved his regular season 3 point % to 36%, his career playoff shooting 3s is 23% - he folds under pressure. And he's a poor shot from 10' to the 3 point line. He may be a good defensive guard, but we just signed Henderson. And Bradley would have to be resigned two years from now.
As far as Noel and Okafor playing together, that was a 2nd year player, a rookie, no guards who could play defense and a coach experimenting - what we found out is Noel can ONLY play center, which means if Embiid is healthy, he's a backup at $20M per year. Okafor has dropped 20 lbs since last summer, I don't have it but there's a picture of him with Simmons and he looks to be about the same size, he's probably 245-250 lbs these days. If he's continued to improve his shooting range, he could be a credible PF.