I said "a simple crop" -- as in, hacking the top and bottom of the BR scenes without shifting them would look odd, hence why I mentioned the action not always being in the middle. I guess I'll have to be more specific next time.
@CSchmidlapp - It was the same transfer as seen on the BR with the edge enhancement present, the IMAX scenes also have the edge enhancement, and compared to the BR are mostly noticeably duller, colour-wise.