does a job like this basically guarantee top MBA admission?

Okay, so this is a very interesting case that I've recently come to know of. A good friend of mine (smart guy, entrepreneurial, etc.) came out of a top undergrad engineering program (not Ivy League, but the equivalent) and landed a job with a billionaire investor and CEO (that most people have heard of) right out of college....as get this...the billionaire's Chief of Staff lol. No idea how he pulled it off, but I'd say this kid has got his **** together haha. I haven't talked to him since high school, but recently caught up with him over Facebook which is how I found out about this.

Anyways, I was chatting with him recently on what his future plans are, and he said he may just stick on at the job if he does well, go out on his own, or maybe go get an MBA. While I think getting an MBA is useless when he already has a job that gives him exposure and connections like the one he has right now, it did make me think.....does having that job basically mean he can get into any MBA school he wants to (Harvard, Stanford, Wharton, etc.)? I know MBA schools look at your undergrad school, GPA, GMAT score, and work experience, all of which he has great qualifications. But, a job like this straight out of undergrad where he's working for a very famous and wealthy billionaire businessman...is like a icing a foot thick on top of the cake lol. I'd assume MBA schools would be scrambling over him to let him in. Obviously, I didn't mention these thoughts of mine to him, but can anyone here comment on this? haha. Obviously kind of a rare/unique case here. Would love to hear any thoughts! (and wish I could've gotten a job like this straight out of college....or even when I go into my 30's and 40's lol)