Thanks for the facts. It certainly is an interesting case of anything can happen.
Starter goofed it happens.
Cars were run down pit lane to timing line, no big deal, they are just gathering data. Really did not mean much.
Sound like the Chief Steward made the right call in impound.
It sounds like we will be reading about the SOM in Fastrack.
As to the unsafe cool off lap you have to be on your toes. Someone could not see a checker in any race. Back when I was flagging a lot I saw a lot of dumb incidents on cool off laps. I would never put down the blue flag on the cool off lap because way too often I had someone come screaming down on someone not paying attention.
The only thing I can think of that the official could have done when they realized the situation if they felt it was unsafe is a black flag all stations.