He played 10 for England in every match except their first one against Italy.
'amirite' no, you seem to get it twisted most the time.
Another quality 10, was NZ's Stephen Perofeta who is another creative 10, able to create and make line breaks and is not afraid take it to the line. What was lost out of the shared 1-1 series in Oceania was that Perofeta did not start game 2, and NZ lost alot of spark as a result. No coincidence that NZ's comeback in that match coincided with Perofeta subbing on. He created 4-5 line breaks and had a hand in a couple of tries before Mason ended up kicking the match-winning penalty.
Mason performed well in Super 20s as part of a well-structured Reds outfit and deserved selection at JWC, but was far from the best 10.
When you look at what he is asked to do it is very minimal. The Reds 20s won the 20s final on the back of a basic structure, with 1 out runners and brute force. They beat the Rebels into submission. The 10 organises forward runners and the ball rarely reaches the wings, and the 10 rarely takes the line on. There is no offloading, no counter attack. They executed that game to perfection and were in complete control.
When the linespeed is faster and the ball runners start going backwards you get no ascendency and it becomes predictable. Thats why you need a 10 who can keep the line honest and is prepared to take a shot at the line to put a team mate through. Play at the line as well as early distribution. If catch, pivot & pass is your only skillset you will fail.