Yes he/she is full. Always happy to hog and gobble up the food .
well mbuna don't know how to stop eating. they wont stop eating when they are full. overweight fish are not healthy and is going to be prone to issues such as bloat. what are you feeding? I feed my adult mbuna once a day and only put enough so that all food is gone within 30 seconds at most.
I agree that it looks like a Kenyi or hybrid of some sort.