What is the word of the 'corporate' disk drives supposedly containing the images?
I have no idea if the Costco surveillance system is redundant. That is one of those unknown “facts” which those in online discussion fora don’t have access to and we do have to wait for them to come out.
What IS known is that the cops refuse to release the 9-11 call, which would demonstrate WHY the tactics which were employed were chosen, AND the surveillance evidence which would show whether or not the Costco employee accurately reported the situation and thus whether those tactics could be justified is conveniently “damaged” and unavailable.
Those are major red flags which to any reasonable person would raise questions about the credibility and integrity of this investigation, and the determined refusal of many in this discussion to acknowledge that fact is sadly ironic. Pointing them out does not make one a “cop-hater” - it’s simply an exercise in honesty.