I'd keep Taj Gibson also. Bullock is a wait and see.
Randle, Portis, and Ellington seem redundant.
But only Randle is signed past this season.
I can't see the FO trading Randle this soon, but if they did there would be suitors.
OKC might want to move Gallinari (ending contract) for a young player under contract like Rand el.
Everything in moderation. Even moderation.