It now is obvious that the lower strut bracket was removed by them where the rotor landed. Somewhere under the rotor was the second strut with the thin silver metal band around it.
They have not disturbed that in all the photos, left it attached to its lower bracket .
The brackets and pins are very important evidence, who knows how long the rotor was going to lay there until it was moved. With the bracket sticking up in the air and easy to remove by sliding one pin, maybe they filmed it in detail then decided it was safer to have it in a ziplock bag and labeled and under their control. Not waiting for someone to wander by and possibly disturb it. Makes perfect sense to me now after seeing all the 5 pins. No other explanation covers the facts.