The conspirators had a side gig as home improvement specialists. A two-for-one service. They might have done some catering as well while knocking off the president. Now how did all these guys "get down the stairs unnoticed" since we are told that was impossible in Oswald's case.
They had business suits in their "Rifleman" lunch cans. They could then pretend they were police "detectives" who had come up from the street. Bonus: If any had room for a Stetson, they could suit up as Texas Rangers!
Anything's possible. McCarthy might do something
not to appease the Facsist Christian Nationalist wing of the GOP.