The timeline of events should be one of the easier parts of the investigation to piece together. If they’re scrambling on this the are either extremely inept, or some serious money is trying to limit their apparent liability.
I consider the possibility that the police were given incorrect information in the beginning of the investigation. Subsequent information lead the police to discover that the information was wrong, and they went public with it. A case of police covering up something would valid if the police DID NOT go public with their disagreement with the timeline.
That's what I am thinking if the timeline is suspect then ever thing reported is suspect. At this point I don't believe anything reported other then the body count.
One would think Jeff Sessions would be taking an active roll in the deadly mass shooting ever investigation. Apparently not, so just what is our Attorney General doing?