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Tebow is reportedly on site and will partake in interviews and all regular tests, but will not be available for any drills.
This is an interesting decision, as Tebow has already withdrawn his name from the list of quarterbacks who would throw at the Combine, joining Colt McCoy, Jimmy Clausen, and Sam Bradford as no-shows in that category.
However, Tebow's reasoning is much different, as the other three quarterbacks are not performing due to injury, while Tebow is simply holding back because of a change in his throwing motion that is not yet refined (and may not be for some time).
While this is quite disappointing, Tebow is scheduled to perform drills at Florida University's Pro Day, so he eventually will display his talents in front of scouts.
Tebow is passing up an opportunity to display his speed, agility, hands, and strength, a solid non-verbal sign that he's completely committed to playing quarterback at the next level.