Trevor Harris is 6'3 215 lbs and he gets hurt frequently as well. I don't think size is the issue.
What will be an issue is going from a well oiled machine running on full cylinders to a team that for the last few years has been in a haze and completely dysfunctional.
It makes a huge difference for a QB when he isn't continously under pressure, having to frequently go 2nd and long, receivers dropping balls or running bad routes etc....
Does Dru Brown have so much talent that he can elevate the mess around him, I don't think so. Hopefully Ottawa makes the right changes to at least give the guy a chance.