Ok, granted. But my question has more to do with how they learned pot odds, sound poker theory, etc.

Let's say it's back in the 60s and 70s and Doyle Brunson is in his heyday. He's playing a whole lot (but not near as much as the Internet players of today) and learning as he plays. When did he find out about the math? Did someone come to him one day and say "Hey Doyle, maybe you should think about making your calls based on the odds you will make your hand compared with the total pot you win for the price you are paying." Surely at some point Brunson learned about pot odds. What about concepts such as the Gap concept. After 5 years of playing did a light bulb go on and he just figure it out on his own? Did another player tell him about it?

So, I guess what I am asking is, was their ONLY source of information their own experience?