I think they will extend Butler. But I think they will wait till they end negotiations with Hightower as it would be a sign of respect. I think if they announced that they re-signed Butler, Hightower would be asking why he wasn't the first priority. Managing high profile athletes' egos is tough. I don't envy Nick Caserio. But I think they have enough experience to work this out.
IMO, I think Hightower will be playing somewhere else. If I had to pick between him and Butler, I'd pick Butler. More crucial position and he's been available for every game.