I don't know if you already answer that but if Sburb wasn't supposed to be played by species like cherubs then why did Skaia create a session and dream bodies for Calliope and Caliborn ?

Because they were going to play a Session? “Not meant to” means like, they don’t have a centralized planet with intelligent life where you can fling a frog temple to and kickstart the game, but they had the code to play the game because they lived in the Veil Laboratory Meteor crashed in Post-Apocalyptic Earth-C, and with Gamzee messing around, so like. They had computers and they had the disc, so obviously they were going to play, and the Session retroactively existed because they were always going to play it, even if their species as a whole aren’t really ‘players’ of the game usually.

Which, now that I think about it, yeah, means that a Carapace Session would totally be possible.