that is the rumour, with, IMHO, quite a compelling amount of circumstantial evidence. The important question, I think, who ever he is, was he acting on his own initiative, or was he acting as part of a larger coordinated plan?
If they identify and charge the individuals in question, if they happen to be cops, it would be interesting to see if they get light sentences or if they get hung out to dry. If they were directed from higher up, then they could spill the beans and implicate their superiors.
Either way, with the initial murder, then the incident with the CNN crew, and now this, it seems that the police departments in question are going to have to face some serious scrutiny.
Other police departments may also feel compelled to examine their own practices and policies, as they're already making statements condemning the Floyd murder and the methods used by the police in Minneapolis. They're dissociating themselves from this as much as they can, as a lot of other cities are facing riots too.
Another thing that mystifies me about this is that, all due to the actions of one despicable cop, so many other cops and civilians have to go through this hellish riot and chaos - which has already become deadly. Why do cops still tend to protect the bad apples, even though they're the ones who make their jobs all the more dangerous?