I think those questioning clubhouse behavior for Soler isn't that he should be a leader, but remember how early in his career he was said to have anger issues and was criticized for not running out grounders and not putting his all into the team. Also, they remember how Josh Donaldson's contribution on the clubhouse was not that good. Clubhouse behavior is important. So, it's a fair question.
I am totally supportive of a Solar signing, I assume he has matured and has become a good teammate. But, it does not hurt to check.