You can still have chemistry on screen without getting on with the person. But it just makes your job a lot easier if you don't have to gird your loins, if that's not quite the right phrase, every time you're going to do a scene with that person.
“I think the intelligent thing about it is that you have to carefully listen to it all to grasp it, and because I'm not in every scene - colossal disappointment to everybody that it may be - I'm not getting the full picture here today while recording it.”