you're missing the point. sullivan played for hull and rovers. he's still hull's leading try scorer. on top of that, he was captain of the great britain team that won the r.l. world cup in 1972. there aren't many others in the northern hemisphere who can claim to have captained a r.l. world cup winning team.
Maybe because there aren't many RL world cup teams?

In all honesty, how many countries actually play RL, and is it big anywhere in the world?