The key bonus to dealing with Chicago is this:
you don't offer #7 so much as you just offer to remove the ongoing restriction on that pick -- remember the Bulls hold that old option the Cavs used to after the JJ Hickson/Casspi trade. So you say, let's waive the restriction, so you go ahead and get #7 this year, but no longer hold options on future picks. That would free us up tremendously to make other moves in the future, and is worth not trying to get the #16 back from them.
And yes, Gibson could play next to Cuz and significantly stiffen our defense. Such a Thibs favorite though, and with them actively determined to shed Boozer this offseason too. Being able to pry him loose might depend a bit on Thibs fate/ongoing dispute with management there. Should be noted he's nto actually as young as you think he is: he came into the league old (24), so he's already going to be 29. That's fine for us to eke out those last 5 years and establish Cuz as a winner early in his career. But it might provide some excuse for the Bulls if management's odd fascination with rebuilding with youth around a damaged rose continues. I do wonder at the point they've sold off Gibson for youth too, what is the point of still having old man Noah. But I suppose he is kind of running the team now, and somebody will have to guide all the kids they seem to want to add.