Together. IMO
I don't have any substantial intel when it comes to Moore, maybe
@CoachTalk does, but I have no reason to think Moore is unhappy or looking to leave. And I'm guessing OU finds a way to make him happier (wink emoji). He's the cornerstone, team leader. It's "his" team.
Kyle and Moore are different. Kyle is pretty much your old school big type. Back to the basket, strong rebounder, athletic, springy, excels at cleaning up a lot of the mess (OREB, put backs, in transition, etc). If anything, adding Kyle would slide Godwin to the bench or at the very least, reduce his playing time (I think Kyle would start, he's just better).