So there is a lot here.
The good:
Harrison has shown again and again he can absolutely work a defense deep. Unfortunately Kyler is usually running and making 1 read by the time that happens.
The bad:
That last drop was just brutal. Rather than catch a perfectly thrown ball at where his hands are, he jumps and then tries to body catch a bullet and drops it.
Overall:
I believe MHJr is anticipating the throws to be high when in traffic and is just making mistakes. I also think that is fair because Kyler is consistently throwing it chest and above to him so I kind of get it. I also think he isn't used to fighting for the ball and is just not physical at all.
I also believe that if Kyler had consistent time to throw Harrison would be a potential rookie of the year candidate. I have seen 3 legit TDs just left on the table.
It can go either way right now. He might fall into a mental hole and just check out. He might also learn to be more physical.