Paul Castellano also did collecting and enforcing work in his early day, yet according to some on here, he wasn't capable of hurting a fly, let alone being a hitter.

Collecting doesn't necessarily require violence. Hell, a guy balks at a debt, a guy like Junior Gotti, who according to his former cohorts was a complete and total pussy, simply leaves and sends his goons to retaliate later on. He doesn't really have to do it himself.