All that is gold does not glitter. But all those who wander with false claims are lost.
What does that have to do with the Umbrella Man?
Fact ...Just after he has raised the umbrella.. a shot is fired and a bullet strikes JFK in the head.
His neighbor ..the dark fellow throws his hand up and then down at the same time in a typical ready... aim... firing squad gesture.
It does appear that dark guy may be fiddling with a walkie-talky in various stills.
Who cares if Chamberlain is associated with an umbrella?...There was no other such gesture photographed or documented in the Kennedy's entire political life.
It certainly took some imagination to come up with that one

Both men sit down for a brief chat and without seemingly any further interest stand calmly up and disappear.
Neither are ever heard from.
The nearest spectators to the president's final breath and then they gone like the mist.