As bad as Sisco, and let's not candy coat it, he's bad defensively, Severino is not the defensive whiz some reported while he was in the minors. While he has a good arm and calls a decent game, he's a not good framer and even before his atrocious game yesterday, he was not good blocker.
Not sure if his mind was elsewhere yesterday, but that was one of the worse games I've seen from a major league catcher.