Murray, in theory, can help that Az team now
That ability to take off and move the chains makes up for other learning issues
Rosen is not that guy

I thought Rosen would become a success, but would require serious attention.
I still think that's true. But that doesn't appeal to fans, and probably not to an owner, either

The downside is if Murray can't find time to develop, too
The Houston kid certainly had the wheels, too, and then suffered the season ending injury.
That's the risk involved with QBs and taking off.