Number one has to be Herb Narvo. In the 1940's whilst playing for Newtown, he was also Australian heavyweight boxing champion.
As far as #4, Les Davidson built up a reputation for flogging everyone in the late 80's/early 90's. One game in 1990 he punched the crap out of Paul Sironen who was dancing around as a hard man up until then. The return game that season him and Steve Roach squared up.
It was the only time I remember Roach throwing punches. He _absolutely_ obliterated Davidson in ten seconds.
It was all class in terms if Roach's martial prowess. To this day, with most RL players still throwing arm punches, Roach is the best at the knuckle I've seen