Since I don't have the evidence to hand you can dismiss this but still, fwiw,
no motorcycle cop went up the slope on his bike and the one cop that actually tried to, did not then head for the TSBD, that's a blantant alteration and it happens in at least two other similar statements and IIRC one was also taken by the same interviewer. So according to the feds three men atop the underpass saw the cop ride up and then {u] head for the TSBD[/u] (Winborns's statement however is a rather accurate description of what Hargis did). Also note how they descibe where Simmons saw smoke.
Robert Jackson says the exact same thing about the bike cop in much later appearances, despite only getting out of his own vehicle to follow this same cop up the knoll and had no interest in going in the TSBD where he claimed he saw another one run into.
Now this is what I don't have the most, there is a stabilized gif of the Bell film showing the men on the OP and some of them(three at least) are "clearly" waving or clapping at the limo, one of them I suspect is Simmons, a tall suspect in perhaps dungerees.
Dillard's last photo in the plaza shows both Simmons and Holland still up there a minute later, the latter having moved to his right(and now stood next to Simmons) probably to get a better view up the street.
Bowers was another one who claimed to see the bike cop ride up the grass, despite it being impossible to see from his position, to me it seems obvious he's heard it from one of the others, that is they've all had time to sit around and listen and compare stories. All these men should have been seperated and questioned on the spot. "...Anything you don't say today and later rely on(for Oswald's defence)..."