I would guess that Szczur probably loses out and gets DFA'd, with Almora on the roster he's pretty redundant, and his specific skills(bench RH bat, CF defender) are duplicated by others outside Almora. Happ's showing this spring also illustrates he has competition coming behind him. Also I can't imagine that too many teams are going to scramble to find room on their 25 man roster for Szczur at the start of the season, he's already basically at his ceiling and it's a 4th/5th OF, so the risk isn't that significant. As far as 3rd catcher goes, I'm not familiar with Corporan as a defender, but statistically he's a shade below average at throwing runners out, and he's consistently been an above average framer. That seems fine for a AAA replacement, especially since the team seems to think Schwarber might catch at least a handful of games too.