The fact is that no matter what the question, when you try to pick an "all time" or "best ever", it is imposible to compare era's. Just as with any sport, todays athletes are bigger, faster and, stronger. Simply put, star players from the 50's, 60's, even the 80's would not be able to make the taxi squads of todays teams, so you have to take things in context and compare their domination at the time of their career.
The 50's are for me a golden era of CFL football. Not only was the game the only professional sport in the country outside of Montreal and Toronto, it was also an era that saw many of the greatest players in the US come to Canada because the CFL was paying more money the the NFL for star players. The 50's and early 60's saw many Heisman candidates head to Canada, including Heisman winner Billy Vessels, and finalists, Kenny Ploen, Joe Kapp and others.