He was just standout for one season, assisting like mad with crosses to Tonis 30 goals, but he was average before that season, and average since then after that. Yes its related to injuries, since he missed half a season, so a clear factor, but mainly he just didnt repeat that seasons performances.
Ofcourse he is better then Molinaro and hence litterally would be an improvement, but proceed with caution when you are evaluating his quality. Because despite us not being able to sink lower then we are in LB, atleast one of them, he would be still a risk because he is, and not trying to be harsh, a one season wonder.