OKC picked up Reggie Jackson and Ibaka with late firsts. They absolutely value their first round draft picks.
Either way, the fact that Bass may have had a better career than Collison and Jones doesn't really address that he's essentially duplicating what Ibaka does on offense to a lesser degree (since Ibaka has started to stretch his range out to the 3 point line) without the defensive, rim-protecting impact. OKC's not going to surrender much for Bass. He doesn't make them better to any considerable degree, seeing as what he has over Collison in pure scoring ability, he lacks in playmaking and passing.
You want to talk about upgrading their starting center or getting a good starting shooting guard? Sure. Inconsistent bench play was an issue, but Bass isn't the guy worth that package for OKC.