\\\\So , what exactly are these new skills that's required in Union that's not there in league ?\\\
In league with the scrum being only a method of restarting a game and possession of the ball being the important factor, the mechanism of scrummaging is simple.
In union, the shape , number of players and the function of the scrum is far more important and hence the rules of scrummaging are more complex........in fact they are often a shambles and interpretation and misinterpretation are often a matter of sheer luck.
Possession is more important in League and territory more important in Union, although that has become less so in the last few years which means that in League the ball is in hand more of the time and off loading in the tackle has become an art, which the Union boys have yet to master.
That is the main difference.
Sam Burgess played no part in the performance of the England team.....they were never going to get to the knock out stage on the performances shown in the warm up matches.