Obviously I'll take your word on it since you would have a ton of anecdotal evidence but I've seen Investment Banking Analysts and MBB Consultants often come from all kinds of majors at the "Smart Schools" (example my buddy majored in Government Policy at Dartmouth and became an IB Analyst) His situation would also be interesting since MBAs usually jump on into Supervisory Positions (since they've had 3-6 years work experience) at those companies.
I just think Shane's Stanford undergraduate degree and national title (and it's not just any national title) will get him interviews everywhere (Wall Street and Business love athletes, let's be honest) and it's really how you do from there (he strikes me as a great interviewer anyways) Those interviews I've heard are brutal for anyone though. (they get very technical but also just ask you open ended puzzling questions, your brother would know obviously haha) I think it'll be really easy to spin that he was the leader of the movement since his face was plastered everywhere.
Either way, seems like the kid has a great plan and will do his due diligence on everything throughout the summer.
I don't want to sound like a ninny and say it can't happen for him outside of Stanford. Just talking about probabilities.
Some pros/cons of his situation:
+ Stanford undergrad degree
- Non-quantitative undergrad (some MBA employers won't even consider this)
+ National champion athlete (especially overcoming the CA shutdowns + sport cancellation)
- No prior work experience (hurts more if he doesn't take a summer internship after 1st year)
+ Save Stanford Wrestling
- 2-yr lag (disinterested parties won't remember to look for him in 2 yrs)
- MBA workload (70+ hrs/week) + wrestling -- no time for dedicated career search
+ Interview skills
- Spicolli surfer dude accent (can be fixed)
By the lag I mean it hurts for jobs that are not posted openly -- those employers won't remember him unless they're Stanford alums or alums/hardcore fans of the 11 sports. He'll need to get on the good side of his MBA faculty and MBA career office, and a well-connected 3rd party can help. All of his candidate schools have these, but Stanford is the best.
You're right about the interviews. My brother's friend (the fighter pilot) was once asked several consecutive accusatory questions about missing targets in the air during a night flight battle in wartime. If Griffith transfers to PSU and doesn't win 2 more national titles, you can bet he'll get asked why he lost. "You went to the best team, with the best coach, and did worse? Sounds like you don't belong in the big time."
To re-emphasize: he can get a high-paying job from Michigan, UNC, or PSU. It will be much harder for him to get a cream-of-the-crop job if he leaves Stanford. Not impossible, but much harder. And that means risking lower pay, increased workload, decreased job security, more difficult progression, etc.
And all of that might be OK by him, depending on his priorities.