I totally agree that decisions shouldn't be made based on what other teams have or don't have. I do think that seeing what other teams have can give you an idea of what kind of competition and cost their might be to upgrade. Then you have to weigh that cost and the priority of that position against whether or not more patience may be in order to see if player development can fill the void.
I don't think any of the catchers with lots of green are going to be available at a reasonable cost any time soon. Danny Jansen (Toronto's "backup") is probably a possibility for a trade seeker, but he's hurt and may cost more than many would like.
Houston currently has the worst starting catcher in the AL, so I see them as a team that will drive up the cost on acquiring someone like Contreras or Jansen.
I should probably take the time to do the NL, so that all the info is out there.