In my book club there is always the overlap - but after 10 years we've figured things out and let more of it happen with less pushback. But when talking one on one I believe cooperative overlap is not needed nor wanted. It's discipline not the removal of excitement or engagement. I like dinners and conversation where it's easy to overlap. Just read the room, if they can handle it do it. If they can't wait your turn - it's coming soon enough.