There is an argument about who is the better RB
Correct, and a damn good one. Saw both of them live when I was a kid. All I can say is WOW!
here is no argument about who is the better athlete
A small one, but it would probably end pretty quickly. Gotta remember Herschel could do just about anything he wanted. Hell, Herschel fought a MMA fight recently.
But I think you are basically correct, not much of an argument. All you have to say is an all star in two major sports. Really all you have to say is - 4.12 - and then walk away.