Good call, arnie and well supported. The problem as I see it is that Youngie was in the Second Division so never had a chance to match Lawson in first division averages or rankings. Also, do you know how many of the open meetings he was in on first division tracks?
Youngie was a class act though. He was undoubtedly the best in the world in 1952 and 1953. There is also good reason to think he was best in the world in 1954 too, although we seem to have given the 1954 GP to Ronnie Moore. In fact, having revisited the year, I think my vote would go to Young for 1954.
Given a full run of GPs in 1951 against top riders I think Young's class would have told and he would have won it. That is assuming he actually qualified. But I'll go along with lucifer sam's view that he would have qualified through the 1950 GP Challenge.