I took a look too. If we added him, it would certainly be interesting. Everything was terrible around him and he didn't play well, like you say... but Shurmur has a reputation for being a QB whisperer. If he can get Case Keenum to play well, it stands to reason he could get the most out of Rosen too.
One thing that's weird about him though... he just has a really strange body type. He's 6'4" but he has really short legs, a long torso, and a long neck/big head. He looks like a little kid back there despite his actual size.