He might have had a choice, but very little money. Players can go into minor league baseball but they don’t even make minimum wage. A co-worker’s son was playing basketball in Germany (after he played in college on a scholarship) and he was lucky to live with relatives. He made about $800/mo (this was in the 1990s) and had to pay all his own expenses including food. College players do better and this kid did (played at Hawaii).
People pay to go to their old college games, buy sweatshirts, donate extra money. How much do people spend on minor league baseball games? A few teams have a following, but not many teams make a profit and they get a lot of money from their major league owners. I’ve lived in cities with minor league baseball and gone to a few games for fun, but they didn’t get rich off me buying two or three $5 tickets a season.
Were other students on scholarship allowed to transfer freely to other schools? Could an Alabama student on a full NMS scholarship just pick up and transfer to Florida State, which had offered a similar scholarship? All 16-17 year olds are making commitments to colleges. I’d argue the student athletes have MORE information than the average student. They’ve toured, stayed overnight, eaten in the training dining room, participated in practices. Is it really going to be that different if they play at Michigan rather than Wisconsin, at Harvard rather than Yale? Did they get to pick their high schools or did they just play where assigned? In California you get one ‘free’ transfer and then you are locked into your high school for sports (with exceptions for parents moving, etc) There have been high school players locked out of playing because they transferred to a private school, left to play AAU basketball, and then tried to return to their first school. And no NIL money.
IMO, the transfer portal has a negative effect on college sports. It makes it very hard for a school to build a team. A few players get to move around and everyone else pays the price that another, maybe better, player is going to come in and bump you when you’ve committed to the coach/school/academics/community. Even in the NFL and NBA, the players can’t just leave and go play for another team. They get drafted and then the team ‘owns’ them for several years.
Michael Oher always needed someone to help him. A minor league football system wouldn’t have helped him. He had no money, no sponsors, no way to get to the place to play minor league footfall even if such a thing existed (could he get to Canada?).
Read his books. His books (which I’m sure he didn’t write on his own) tell his story and it is one of drugs (not for him), poverty, insecurity. Read the stories of other NFL players. Many came from poverty but very few got to college and then to the pros without help- a high school coach, a strong family supporting them, and a whole lotta luck.