Originally Posted by 76Texan
For whatever reason, the Tigers wanted him to key off the Olineman's movement in most instances.
If the Texans want him to key off the ball, he will.
The guys at battleredblog (Brett Kollman specifically) commented on this saying that it takes a lot less time to teach how to key off of the Tackle rather than the ball, and that with the limited amount of time to practice in college, this technique is taught because it can be taught in a few hours.
Much like the 3-step shuffle technique you see a lot of slower corners use in college to mask their speed deficiency, it's taught because it's easier and can cover up some things. It sucks as a technique in the NFL because all of the skill position players are elite, unlike in college where you might only run into a few truly elite talents at those positions.