Thanks for the compliment.
I wouldn't call myself an "animal behaviourest", but I've always enjoyed observing
the interactions of cats over many many years, so maybe that makes me an animal observer?
As for keeping them separated forever? I don't think you'll have to do that. When cats really love and respect you, I think they like to please you and behave themselves most of the time. Cats do like to "play fight" to have fun, and chase each other around. Sometimes they do it to attract attention, if they think they're being ignored. I know my two get into play fights or into mischief if I get into a long conversation on the phone just to get my attention. So they're really like two y.o. kids!
But could never live without them, right?