not quite. JKS was all in on Cal and was a long time commit. Allegedly, Mendoza called him the day before signing day and talked a lot of shit about how he wasn't going to come in and take his job, he needs to know his place blah blah. There was a bit of a perfect storm around that alleged call and his subsequent disillusionment over the Cal "family" atmosphere he was drawn to plus a ton of pressure in Hawaii to commit to Oregon (continue the legacy of great Hawaiian QBs at Oregon) that he impulsively pulled the trigger on early signing day to go with Oregon. Both Cal and Oregon staffs were stunned and hadn't even thought it was a possibility (Oregon signed 2 other QBs that day because they didn't expect JKS at all).
Mendoza then promptly transfers leaving Cal with nothing in the QB room. This is why a significant portion of the Cal fanbase now hates Mendoza with the fire of a thousand suns. Everyone gets it that he might look around after getting pummeled all season cause the Oline sucked ass. But there is a lot of distaste over how his Dad was shopping him from mid season on, quitting on the team the week of the last game at SMU (he was "sick" yet laughing and joking on the sidelines while the team got railed), his immature and not factual bitching about how much NIL he was getting compared to the other QBs and then the infamous call to JKS that helped flip him away... Fernando Mendoza is a fucking little insecure bitch who thinks he is way better than he is.
Anywho, JKS gets to the Oregon campus in the dead of winter and lasted about 2 weeks before he was all "fuck THIS", called the Cal coaches and promptly transferred before the Spring semester started. And that, kids, is how Jaron Keawe Sagapolutele came to Cal.