No replays?

Err incorrect, he talks about "voteresign" vote resign is not exit.
Resigned matches are to be recorded bu there was a bug (fixed in master and not deployed) which prevented games with multiple bots to be saved properly.

I've noticed the same thing as well. The post battle screen after exiting also tells that "Battle link not found." and the replay can't be found even by browsing through the collected replays. It seems if there is a team consisting entirely of AI, a replay is somehow not saved. It doesn't seem to depend on the type of AI either as matchmaking still uses CAI while most custom battles already use Circuit.

Also, these battles give no XP for the players either. I'm still experimenting to determine accurately in which cases no XP is rewarded but at least when no replay is formed no XP is given either. So far evidence suggests that this concerns most Co-op games even when starting via Chobby matchmaking.

This is a shame especially for beginning players as Co-op is a more rewarding training platform (as you usually don't get commsniped or focused down as easily as might happen in team battles or FFAs).

Allow me to clarify my previous post: my point was that even Co-op games started via Chobby's matchmaking queue yield no XP. My opinion is that this should be changed to give at least a fair amount of XP as these matches should be somewhat balanced and provide a sufficient challenge for novice players. This could be changed so that after a certain accomplished player level no further XP can be gained from Co-op games. This could also provide some degree of motivation for these players to start then taking part in team games etc.

Would it be possible to get a knowledgeable comment on the replay issue as well?

but hey! At least we managed to steal teal color from players... ^^