Maybe I'm missing something, but as best I've been told, Trubisky is most of the tools but no toolbox under pressure, right?
If so, I don't see the issue with taking a guy with the same physical tools in the first and hoping they can build a better toolbox by developing him better, and let Trubisky take the brunt of being on an average at best team until the kid develops. I'm not super-excited by them doing that as I'm not excited by any of the guys in the first, but it's a reasonable play if they see talent they believe in.
It's not like going QB in 1st vs DL/OL/SS in the 1st and QB in 2nd/3rd is going to radically change the team's chances this coming season anyway.