Define "passed." Once a student has completed a year at Stanford they are welcome to return to complete their degree at any time. In Tiger's case, his success on the links rendered that guarantee unnecessary. But imagine he had a career-ending injury at 23 - can't imagine he wouldn't have wanted to come back and get it. And funny you should pick that example: Woods said
in an interview a few years ago that not staying at Stanford one more year and completing his degree was his "only regret." Given the other actions he taken that one might reasonably think he should regret, that's quite a powerful statement, IMHO.
Incidentally,
Astros All-Star Jason Castro is one example of a top Stanford athlete who went pro prior to graduation and returned in the off-seasons to complete his degree. Not to mention, there are a number of other notable and highly successful athletes
who have returned to their undergraduate universities to finish their degrees, both while still active and after retirement. Like many student-athletes, how much they emphasize the student, and the athletes, will vary from person to person, even for some who will be making $$$ after going pro.