I think the man pictured above, Frank Whitcombe, is one of the few to make the transition very succesfully. He came to RL when they had contested scrums and unlimited tackles which made it a war of attrition. Of recent times Maurice Coulman at Salford made it and Northern signed a Stuart Gallacher who weren`t half bad, but the modern RU props game is completely alien to the SL game IMHO.