Re: high speed wreck
One of the effects of mj is an impairment of cognitive functions that lasts longer than the high. So of the two mentioned possible causes (1) failure of the clutch to disengage, and (2) mj, I still maintain (2) is the more likely scenario. Not being able to downshift simple cannot cause a crash under the conditions you describe.
What you describe sounds a lot like poor judgement - (mj impairment?) - riding 100mph on bumpy, imperfect roads with gouges from road construction and accidents, out-running your sightlines, cornering aggresively on familar roads that you know are (again), bumpy, imperfect and gouged, with ongoing road construction.
The reason you couldn't have gotten a dwi/dui was that the police didn't bother to test you. You might well have tested clean, but from all of your description of the riding up to the crash, the crash itself, and the aftermath, your judgement wasn't spot-on. I don't know how much of that had to do with mj or how much with other factors. Obviously, the post-crash behavior could be mostly attributable to shock.
As you say, I don't know the road where you crashed. But I have known a number of users, and I've done a bit of study on motorcycle safety and crashes. I'm glad you had your gear on and escaped w/o serious injury. I hope you give serious thought as to the contributing causes of the crash so that you can avoid the necessity of repeating the incident. As you say, no need for a fight between us, as the fight was already fought between you and physics.
Eyes, brain, hands. Repeat.