I think that pro athletes are at the bottom of the entertainment biz when it comes to brains. Their marketability is their physical skills - intact - first and foremost. It gets parsed, details are explored - but only after the ability to hit the field is established.
PT Barnum: "So you want a continuation of your job on the high wires".
Applicant: "Yes. I have a proven record of performance".
PT Barnum" "I see. Well, hop on up and let's see if you can still do that".
Applicant: "No, not until you sign me up for a whole year's pay".
PT Barnum: "Next, please".