Awesome questions, thank you!! My thinking was to have the final contributors post the games to itch and add the other contributors as admins to the game, but as Luke pointed out, I think it's likely that many people will be posting their .txts. I'll be making all .txt or other text files available to everyone after the jam is over (and as final submissions come in), so individual collaborators can post their contributions or final submissions to their own itch pages if they'd like (and format/edit/change to their liking). 

I'm nervous to suggest any recommended pricing - I think I'd prefer to have collaborators discuss amongst themselves. The .txts will be made available to readers for free so that they can judge them, though!

Thank you for asking this!! I've changed my mind, and am now gonna require that 3rd round submissions are .txt files, so that 1. it's easy for me to provide the .txts for everyone to access (especially the other collaborators, who likely have an interest in taking those files for their own purposes) and 2. so that the final collaborators don't have an expectation of a different kind of labor (i.e. layout and etc).

semi-randomly! "semi" just to ensure that no one works on the same game twice.

This is actually one I've been thinking a lot about. Certainly at the very least, I'll notify everyone involved at the end. If the second step doesn't come through, I'll send off the game-seed from round 1 to someone for the third round, too (and tell the original collaborator what happened). I'm also hoping to be able to reassign stuff if I learn in time that a collaborator drops out (and ask if early finishers have the time/energy to work on the dropped game) but of course that depends on hearing from the person who's dropping out!! Which I know won't always happen. Hopefully with timely reminders and posts though we'll get most of them. 

absolutely!!