I wonder about two things; first, if a litter gets munched, how will you know which one did it, and, second; unless the two does and the buck are all in the same line, whose babies are whose, or even if you do know, sometimes one doe will produce better quality meeces than the other, and you'd want to know that.
Right now, I regret having the two yellow does and Mondo together, since now I don't know which one of them carries aby.