RE: Greatest archer?
Yep. How can anyone lay claim to being the greatest bowhunter of all time other than the people whose day to day survival depended on their bowhunting skills?
But, if you want to know who I think has had the most impact on today's bowhunting... NOBODY has even come close to equalling Fred Bear as an ambassador for the sport. Lots of guys have taken more P&Y trophies than Fred, but they're all more interested in promoting themselves than anything else. Bear promoted archery and bowhunting and introduced the sport to the masses. (And, as a side bonus, created a market for his products)