Offensive tackle poses an interesting situation for the Miami Dolphins in free agency. You could argue the Dolphins are close to being talent-rich at offensive tackle. Both starters, Pro Bowl left tackle Terron Armstead and young right tackle Austin Jackson, will return. The Dolphins also could re-sign both of their primary backups — 31-year-old right tackle Brandon Shell and 25-year-old left tackle Greg Little — at a reasonable cost in free agency. Kendall Lamm, the 30-year-old who started briefly before sustaining an injury, also is an option, as well as 26-year-old Geron Christian, another late-season signee. The Dolphins have the option of shifting right guard Robert Hunt to tackle, the position he was drafted to play.