Hypothetically speaking (because Butler is going nowhere), for Jimmy Butler to even consider us over the Bulls or rival suitors we'd have to be playing a LOT better. So much so that being in a position to draft Okafor or any top prospect would then be impossible or extremely unlikely.
We're not going to be getting the FAs that are in demand this summer. Everyone should focus their energies on FAs who are not as desirable. Maybe we have a shot at a guy like Kyle O'Quinn or DeMarre Carroll. Generally speaking though, guys who are young and available are so for a reason - they disappointed somewhat in their previous stops and the Celtics would be banking on some hidden value. Take Evan Turner for example, nobody wanted him after his lackluster year on two teams and that's the only reason we could get him.
Of course, the possibility always exists that we could overpay someone who we deem as undervalued compared to the market, but I don't see a name out there that we should acquire in that fashion. Like, would it really be worth it to outbid Philly and other teams for KJ McDaniels? Or Enes Kanter, Reggie Jackson, and Bismarck Biyombo? Do any of those players have the potential to live up to an overpay?