I generally agree with your take but there really isn't any precedence when it comes to which champs get instant rematches when they lose. Aljo didn't get one when Sean knocked him out. And of course the most obvious was Jose Aldo not getting one either. I'm not saying Val needed to climb through the rankings again, but asking her to pick up just one win shouldn't be out of the question considering how she lost her belt. No one expected Grasso to win that first fight, and certainly not the way she won. That's why its better to actually have these fighters fight rather than just assume what would happen if they did fight.