The game has changed vastly to the point Star fullbacks command Monster $$$ as are involved far more than chiming into the backline, kick returns and last line of defence as now ball play and more involved ....heck your wingers are now the biggest inflences on momentum at times and used to be skinny fast ppl that stayed near the chalk and were only involved if the ball came their way and were horrible tacklers (some still are) ....then the old front row has always and will always be integral in winning the middle which as we all know, paves the way for victory more often then not and is the foundation of any team....the cunning hookers now quicker than ever, are so crucial as have more touches than the rest and dictate direction in attack and get their players hitting over that advantage line and some even have a kicking game.....centres are gamebreakers and the 1 on 1 battles can decide games....backrowers are like backs in the pack, punching holes every opportunity and defensively can control opposition attack with good, physical decisions.....the locks are still workhorses but some are now laced with attacking thrust to bend lines and make the occasional line break, generally creative and great defensively.....the 6 and 7 has changed a bit, with both owning either the right and left side, or edge as they call it, but control so much on the field setting up much of the teams success and failure which is why my pick for Most valuable would be the 7....but there's many reasons other positions "today," could also lay claim to the Most Important mantle ....I know blocker Roach or old Rex Mossop would say front row and offer some decent arguements along the way