@BJH65 I'm glad you posted.
Its easy to sit and watch video over and over again, from multiple angles, and pass judgment. However, there are so many factors involved and those factors you referenced are very important. I still haven't come to a conclusion on this case yet. We need officer statements, witness statements, reconstruction and more.
My last two years of my career, I spent countless hours reviewing use of force cases. I learned there is so much more than a video or multiple videos.
For my viewpoint at this point in time: The officer was justified in his use of force, however many training issues need to be addressed. Particularly, if he had been drug by a vehicle before, why did he place himself in this position? Also issues with the other officers on scene, before and after the use of force. That is where I sit, and more evidence could arrive that could sway that opinion.