I really don't buy the excuse that playing well in preseason means nothing. I have never seen a qb play really well in every preseason game than stink it up in the regular season. I think it is a good indicator.
Look at Dak last year, he tore it up in preseason, but people were saying it was a fluke, then he showed it was for real when the regular season came around.
QB's like Osweiler, Bortles,Hackenburg, and Glennon are stinking it up in preseason, and the teams seem to be taking that as a good indicator they should not be their starters.
Supposedly there have been teams calling the cards inquiring about trading for Gabbert. This is the same guy that was a free agent 3 months ago, and they could have got him for nothing.
Apparently they are valuing his preseason performance, because that is the only thing that has changed.