Go to the nearest dry-erase board. Write down everything you want out of a safety. He'd probably have nice size, great speed, coverage skills and a penchant to hit anybody who walks within a 50-yard radius of him. While that last attribute could make it difficult to get him to class on time, all of those are wrapped up into a nicely bundled package in Colbert.
First off, Colbert is really fast. He's a legitimate college track sprinter, one of the top 400-meter runners in the state. And he's been clocked in the sub-4.4 range in the 40-yard dash, meaning he's a safety with elite speed on the football field, a need for the Longhorns.
Second, at 6-1 195, it would be difficult to draw up a better frame and build for the position. Colbert has the body to add good weight while maintaining his special athleticism.
And third, while everyone knows about Colbert's speed, it's his hitting that arrives early in his highlight video. Colbert is an excellent tackler, somebody who wraps up and drives through the offensive player with tremendous momentum.
The great part about that is that the Longhorns appear to be looking at safeties who can play a variety of roles, and Colbert fits that to a T. He has the range and speed to be a free safety, while also boasting the tackling ability and in-box play to be a special strong safety.
Colbert is the reason you like to have a few spots lying around later in the process: as recently as last spring, Colbert figured he would be running track, and not playing football, at the next level.