If Greer didn't shoot jfk then why did he pass a covered object before the shot [and that same object was seen magically going to floor after the shot?
Who the hell knows why, or even if that is what he did? For all you know, Greer could have been jerking off with a jelly donut. Do you realy think that barely perceptible and highly speculative and subjective interpretation of such subtle action in a blurry 8mm enlargement amounts to conclusive evidence of anything?
It doesn't.
What is more, it doesn't matter; unless you can argue that the "covered object" which Greer was supposedly passing prior to the head shot could possibly have been a high-powered rifle, which you obviously cannot.
That head shot did not come from any handgun which a Secret Service Agent might possibly be carrying. That is the bottom line. You can go on and on about bleach spots and covered objects all you want. It is moot.
JFK was not shot in the head with a handgun.