My 2017 offseason is a bit different. I don't think we're getting Durant as well as OKC has been playing of late. I do think Harrison Barnes is obtainable, and so in the likely event we strike out on KD, I'd hope we sign him and Horford. We'll probably have another $15-20 million in cap room in 2017, but by that point could have a pretty full roster. Meanwhile, IT could still be our best player, but would have the 5th or 6th highest salary on the team. At a certain point, that's probably going to make him chafe a bit. I would take most of our cap room and offer IT an extension that raised his 2017-2018 salary to the $18-20 million range, and then had a few more seasons (three is the most that can be done under the current CBA) at that level. It would create a happier star, and also keep him off the free agent market, at probably a lower cap level for future years.
Depending how much cap space is left, and how much he continues to develop, I might try to do something similar with Bradley and give him a $4-6 million or so raise. That's less important, but I would definitely take care of IT.