I can only speculate, but I'm decent at speculation.
First? He slid in the draft. Being a players kid that might have stung.
Second? He knew it was a redshirt year. He was 4th on the chart.
Third? Covid.
Fourth? Complex play book.
Fifth? Might have expected to.just be given the job after Everett left.
So now Mcvay can goad him by leaving him out and giving Harris reps.
Truth be told, Harris is 219. He's not big enough to take in line snaps in the NFL.
So Hopkins will get a shot to jam his foot in the door before it closes on him.
But ... we're a super bowl contender. He has to move at the appropriate speed.