Exactly
The problem as well with people saying they are the greatest of all time, is most of us simply did not see all era's play.
I for one think they are the greatest that I have seen, but I can't even compare to Montana/Walsh because I was too young, and I wasn't even alive for Bradshaw days in the 70s.
That's why it is confusing for me to hear people under like 65 years old say that "these certain guys are the best of all time".
It's like, how can you say that if you've never seen other greats play?