This is, at least, a bit better situation than it was at this point last season, when we weren't sure who was going to be our starting catcher either.
Particularly early on in the season, the catching position was a state of flux for Arizona. Rule 5 pick Oscar Hernandez began the season on the disabled list, thanks to a broken hamate bone in his left hand, and it wasn't long before he was joined there by Opening Day backup, Gerald Laird. He managed to last a grand total of 4.1 innings in the field before lower back spasms led to his departure - he never returned.