"He's a kid that I think wants to do well but needs to be shown how, and he didn't always get that help, in my opinion," one Browns staffer said.
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The biggest on-field concern with Manziel as he moved into the NFL was whether he could master the nuances of a pro system. At Texas A&M, the emphasis was on tempo, calling plays in a hurry and getting to the line to run plays quickly. In the NFL, pre-snap reads, protections and coverages matter more than tempo.
At A&M, the center made protection calls and Manziel's job was, in part, to find mismatches, often throwing to dominant 6-foot-5 receiver
Mike Evans or scrambling when plays broke down.
"The way we talked about him in meetings, the kid never put in the time he needed to -- studying film, organizing workouts, 7-on-7 workouts -- he didn't do it," said one NFC scout with a Southeastern Conference focus. "His thing would be he's going to show up on Saturdays, 'I'm a gamer.' He'd show up for practices and games but that's about it. Johnny thought he was an NFL superstar before he came [into the league]."
One A&M source said Manziel's attitude is catching up to him. Manziel was lax in preparation unless the Aggies were playing a top-tier opponent, such as Alabama or Auburn, when "you couldn't get him out of the film room," the source said. Against Rice or Sam Houston State, not so much.
http://espn.go.com/nfl/story/_/id/12216266/cleveland-browns-quarterback-johnny-manziel-struggled-commitment-preparation-sources-said?ex_cid=sportscenterTW