The side-by-side video of his delivery is excellent. It seems crazy that something that small would make so much difference. Kinetically, you can see how he uses his core and legs more earlier in the year.
That doesn't really explain how he has been completely missing the zone. Unless his muscle memory simply hasn't caught up.
IIRC, Corbin Burnes abandoned the 4-seamer to integrate the cutter. I wonder if that is the same path that Harrison is going to take.
It is too bad this is happening at this point in the year. If it was a month ago, he could go down, work some things out, and get back to where he was at the beginning of the year. I am not ready to give up on him. He showed some great things earlier in the year.