I have to hope this is Sullivan speculating, versus reporting something that has some basis in reality.
Teagarden has caught 44 games in the last 2 years. He's played 29 games above high-A ball, and while his offensive line was encouraging in AA, he also had a ridiculously high strikeout total, something that suggests to me that he's going to be way overmatched by major league pitchers.
Teagarden needs to play every day. The only way, it seems to me, that he can do that is by going to the minors.
Adding him to the 40 man roster and having him catch a couple of times a week is an awful, awful idea, and if the Rangers are seriously considering this...well, I don't even want to think about that right now.