I don't know that the alternative world is one where Garneau would be starting catcher for a full season - stands to reason that Haase would be starting most games without Barnhart. Offensively at least, hard not seeing Haase as less of a black hole.
Of course, there is a tradeoff defensively with Haase starting... I know part of the enthusiasm about bringing Barnhart in was his ability to frame pitches, play defense behind the plate and to call a game. But at the end of the day, I'm not sure the Tigers wouldn't have been better off trying to acquire more of a depth option (ie. Luke Maile, Steven Vogt, etc.) versus Barnhart with the idea that he would be everyday starter. Or just live with the situation as it was (ie. Haase, Garneau, Lavarnway, Dingler).
It's early though and maybe Barnhart starts progressing toward his mean.... but still can't help the feeling that he's been underwhelming, particularly for a guy for which there was a lot of praise for acquiring and for a guy where extension rumors have been swirling.