Taron has lots of speed (as shown by his interceptions for TDs), good hands, is good in run coverage but not matches well vs most teams #1 and #2 CBs who sometimes need to play against sideline which takes different techniques. In addition in last year and half the Bills have recrafted the defense to being a true 4-2-5 defense with him being a vital component in that defense so anything Bills gained by having him be outside would negated by loss in middle.