I have a theory on how Cal and LeBron had a falling out. Back in 2014 after we had just lost to UConn in the title game, this was around the time Cal to the NBA rumors were at an all-time high. This was also when LeBron would announce he was returning to Cleveland.
My theory is that Cal and LeBron had a handshake deal in place that Bron would work his magic and get Cal that Cavs job after announcing his return to his hometown team.
But then, the Harrison twins announced they would return for their sophomore year, then Willie CS announced his return. 3 surprises returns and Cal starts to think “holy **** I might have something special here and I want to win another title”.
Cal breaks this news to LeBron, who ultimately has to settle with David Blatt as his coach and we saw how quickly that flamed out.
Also this is around the time Coach K is heavily involved with Team USA so LeBron naturally gravitates towards him. Coincidence that this is around the time UK starts losing top high school guys to Duke?