Yeah as JFaS has pointed out several times, that would be the best internal option on paper but I don't see it happening. I think the team just wants to cut ties with Thole rather than roster three catcher of if they don't want to lose him, they'll use Kratz's option (much like Thole himself started the season in the minors last year while the team went with Blanco).
The basic problem is that the team didn't address his needs in the off-season and pretty much has to go with the s*** at the wall approach. Might as well see what Sierrra, Goins, etc. can do. It's not a contending team's approach but this team is so damn passive that I don't even know if it's even trying to contend at this point. It feels like the team is holding on to its veterans more for marketing reason than in order to make a real push.