Don't worry about thinking in terms of posting-rounds. I think it's completely fine to do a bit of back to back posting, provided the posts have substance. I'm not a big fan of collabs, because I think they add a lot of fluff and comes off as being tougher to read - but discuss with the person you're gonna interact with about what you wanna get done in an few posts, much like we've done with the relationships and it'll all work out just fine. As illustrated by the frankly, above expectation work done on the relationship-sheet.