Hendo has a wrestling background but his MMA fighting style is not focused on wrestling.
GSP did many disciplines before doing any wrestling. But his game plan relies heavy on wrestling.
It's not really the norm, but there are still plenty of guys like that. Chuck later in his career was obviously more focused on striking with wrestling being used more for defense. But if you want to throw around labels then right now I would call GSP a "wrestler" and Hendo a "striker". Because that is what their game plans focus on.