Whoever is advising this kid is absolute trouble. Jalen gains nothing, but loses a lot, by not finishing the season.
He could talk to the coaches behind the scenes, discuss moving out to WR or TE some, gone on "medical reserve" so to speak (lay out under the cover of injury - believe me it happens sometimes), whatever, there are only 4 regular season games left anyway. he could suck it up, finish the season, maybe get the record but at least get really close, then announce the transfer in the off-season. If that happened, he would have maintained his relationship with the fan base, maintained the respect of his team and coaches, made it easier to transfer somewhere else, any number of positives.
If you've lost the eligibility anyway, why leave now?
If you're this close to a very reachable record that would make you a LEGEND, why leave now?
If care about your teammates and school at all, and there's any chance that you can help them in any way, why leave now?
Instead, he is tagged as a quitter for walking out on his teammates (supposedly his family, brothers, so on) in the middle of a season for selfish personal reasons. He has still lost this year's eligibility, and now he'll be forced to sit out a year unless he goes FCS D2 or JUCO.
If, as Vol74 wrote, Jalen is taking a beating at RB so he wants to protect his ability to have a long NFL career someday by switching to WR/TE, then why not make that switch here first and finish the season? And who is telling these kids that you won't take a beating playing WR or TE in the NFL?!?! Every play for a WR or TE is a concussion risk in that league.
Bottom line, the excuses and spinning can't cover the fact that this whole thing is monumentally selfish and downright idiotic. Bad decision that will not only impact Jalen, but will also all the (former) teammates, coaches, etc who were counting on him.