Lester's abilities lie as a center fielder with ball hawking skills, as attested by his 14 career INT's.
While his size would indicate he's built for the SS job, tackling really isn't a strength of his. I don't think he ever broke 50 combined tackles in a season, maybe once. He's a FS in all reality. His game is similar to a guy like FS Kerry Rhodes.
IDK, safeties are becoming more interchangeable these days anyway with the multiple receiver sets and TE's.
Davis was a much more attacking/tackling at the line S at Georgia when he make the switch.