It's the same story every year:
Rookie gets drafted into the NFL, so he automatically thinks he's better than he really is. He goes to OTAs and M/Cs where the speed is more along the line of a 'walk through' and thinks, "Hey! This ain't nothin!"
Then the veterans show up, they strap it on ... and then go out there and show them they were wrong.
NFL strength and speed can make an honest man out of ANYONE!
Have a good one