Sure, here is an alternative hypothesis: The mob did not show ANY detailed level of knowledge that wasn’t readily apparent from any tourist map of the Capitol (“Breach east side. Turn right for the House. Turn left for the Senate.”)
Thousands of shitheel asshole insurrectionists fanned out throughout the Capitol building, shouting insurrectionist shit, smashing other shit, and chanting shit about hanging Mike and Nancy.
Some of them did that shit while mobbing their way past Clyburn’s unmarked door.
End of unremarkable hypothesis that is entirely consistent with the available facts, and that does not require extraordinary facts to support.
ETA: Apologies, I forgot to reference a Capitol tourist map before writing. From the east side of the building, it’s LEFT for the House and RIGHT for the Senate. So basically a 100% chance that you’ll stumble across one or the other without having even bothered to consult the tourist map.