I think Pinto and Hermann both start at AAA. They need to develop as I could see them being a great catching tandem for a long time. One bats right, the other left. The likely backup also can play other positions - almost an ideal situation if they develop and take the next step.
So in your scenario, the Twins Catchers will be? Doumit and....? (I actually think this is how this is going to play out and long-term, that tandem might be the answer. I have 2 names in mind to become the regular C in the meantime, just wanted to hear your prediction).