The big red flag that I have always had with Vince came out at his combine.
Originally it was reported that he scored a 6 on the Wonderlic test. Later... some damage control came out from somewhere and it was said that he was given the test again and he scored a 16. Many doubt the second score.
The thing is... I'm super familiar with the Wonderlic test. I'm in the school business and I've been using that test as part of our school's entrance requirements for 30 years.
Many can try and poo poo the test and how the scores translate to the football field... but I will say that I am confident that someone who scores that low on the test is going to have a difficult time playing QB in the NFL (especially today). Somebody with a score like that needs to stick to the defensive side of the ball.