Not that anyone cares, but here's my take on Brennan. And I'm a fan.
He's undersized NFL wise, at least right now. The height isn't an issue, it's the weight. He'll need to put on an additional 20 lbs on his frame to withstand the NFL game. He is a system quarterback, and he fit into Hawaii's system very, very well. I give him credit on accuracy, but less so on the deep ball. Decent enough arm strength for the NFL, and decent mobility.
The problem I have with him is from what I saw of him in the Senior Bowl, both in watching some of the workouts on NFLN, and in watching the entire Senior Bowl. He had a problem grasping the offense during that week, and during a game in which he saw the most vanilla coverages and defensive schemes he'll ever see, he looked bad. Real bad. I know timing is off during these All Star games, but he was late with every read and every throw. Couldn't make the check down throws that you need to make in the NFL.
EDIT: Bottom line, he's decent enough to sign with a team as a Free Agent and will be brought into a camp, I'm sure. I'm betting a team will sign him to the practice squad and see if he can develop both physically and mentally. Maybe someday he can turn into a player, but I think his limit is at the backup level in the NFL.