Moon admitted that Manziel's risk-taking makes him a very exciting QB to watch, but is not sure that he would be able to get away with as much as he has done in the past against NFL players.
"Well, he's one of the most exciting players to play college football, no question about it," Moon told SiriusXM. "He's a risk taker, and he gets away with a lot of those things.
"I just think in the NFL, some of those things he's going to have to take out of his game. He just won't be able to get away with some of those things that he did in college football, especially taking on people, being as physical as he likes to play the game. I don't think you can do that in the NFL or you won't be available for your football team.
"He's doing all the things right to move himself up in the draft, but still, what makes Johnny Manziel 'Johnny' is those special, magical plays that he makes, and I just don't know if there's going to be as many of those when you're playing against the talent that he's playing against in the NFL."
Manziel rushed for 1,405 during his first season with the Aggies.