If his stools are looking good, then he was prolly just really hungry! Maybe time to increase volume and/or *very* gradually start introducing his regular diet back in the mix.
Start SLOWLY, literally just a small handful of kibbles thrown in with the ID meal tonight. See how that goes for a day or three, then very gradually over the next week or two, increase the kibble-to ID ratio...
If he shows any signs of backsliding, back up and start over.