While the knock on Grier is his supposed garbage arm strength, I read this:
"The Panthers needed to find a quality backup behind Cam Newton, and Grier should be just that. Grier (6’3/217) transferred from Florida to West Virginia for his final two seasons, where he went 15-7 with a 66% completion rate at 9.4 yards per attempt and a 71:20 TD-INT ratio. Excelling in Mike Leach disciple Dana Holgorsen’s Air Raid spread, Grier cleared 300 yards in 19-of-22 starts. As a 66th-percentile SPARQ athlete, Grier offers plus mobility and standout accuracy, and he clocked 59-MPH ball velocity on the Combine radar gun, the best mark of all quarterbacks in Indy. Knocked by some as a "system quarterback," Grier’s college tape reveals an aggressive gunslinger with some similarities to Tony Romo."
How can you have the highest ball velocity of every QB at the Combine and have a trash arm? Seems like that's more important than being able to throw farther than you ever would in a game. I guess it has to do with not having a good enough arm on the run, when your feet aren't set.