Gonna keep this simple. Teague took one on the chin for the team. He cannot play CB at an SEC level. He proved it over two seasons. He will not get physical in tight man coverage, has stiff hips and has no ability to recover. He is playing out of position, but he tries to the level of his ability. He is a version of Cobb. The two head coaches chose not to develop and showcase him that way. It's probably too late to change now.
Mark Jones was faster and a better athlete. His NFL play confirms that he had his niche. He played out of position most of his UT career as well. They finally got it right his senior year. Fulmer/Chief did it to Rashad Baker. Made a safety out of a small WR. He was lightening in a bottle in HS and was a top 10 rated WR. They converted him and he did go on to a 6 year NFL career. But he was simply too small to be a starting safety long term (see Bob Sanders) and too stiff to be a CB. Had they left him alone he probably would have been a special WR for years.