Sorry, but I think you're way off the deep end here.
The NCAA does not allow athletes to borrow against future earnings for any purpose other than to buy "loss-of-value" insurance.
https://fansided.com/2014/10/15/ncaa...ngs-insurance/
The attached eligibility guide Georgia Tech publishes for agents (
https://ramblinwreck.com/wp-content/...l.pdfexplains:
“Pursuant to Bylaw 12.1.2.4.2, student-athletes are permitted to borrow against future earnings potential from an established, accredited commercial lending institution
exclusively for the purpose of purchasing insurance (
with no cash surrender value) against a disabling injury or illness that would prevent them from pursuing a chosen career, provided NO third party (including institutional staff members, professional sports counseling panel or booster) is involved with any arrangements for securing the loan.”
The insurance pays off only in the event of a disabling injury or illness, so it can't be used as a source of cash while the player is in school.
Other loans against future earnings are prohibited.
https://profootballtalk.nbcsports.co...family-friend/
Specifically, NCAA Bylaw 12.1.2.1.6 defines as a prohibited form of "pay" this: "Preferential treatment, benefits or services because of the individual's athletic reputation or skill
or pay-back potential as a professional athlete, unless such treatment, benefits or services are specifically permitted under NCAA legislation."
So, no, despite its economic logic, for either a bank or a family friend to loan an athlete money to be paid back when they go pro is plainly an NCAA eligibility violation.