Lelito, if signed, would be competition for Josh Kline. The offensive line was really good last year, but Kline was the weakest of the group. It's always good to be looking for guys that can upgrade or even be quality depth.
PFF graded Lelito as their 49th guard last year. That is pretty solid. He has also only missed 1 game in his 4 years in the league according to Pro Football Rumors. Durability is an important quality in an offensive lineman.
Jon Robinson took over a roster that was devoid of talent. He has done a nice job building that up from 1 to 53. The fact that he is coming in for a visit doesn’t mean that the Titans will sign him, but he would be a nice upgrade to the roster.