The “Bullet hole” in the windshield came from bullet fragments from the rear. Google photos of the hole and you will see it is too small for any bullet to pass through. And all the bullets from the sniper’s perch, the bullet found at the hospital and the bullets fragments were tested twice and they came from the same box of bullets. You do an analysis of the lead content and impurities. They all match in content percentages.
Sorry, the “sniper’s perch” you reference was created by the Dallas police AFTER the shooting from a series of cardboard boxes; they rearranged them several times and this is where the fingerprints of LBJ’s hitman, Malcolm Wallace, were found. BTW, the Texas School Book Depository was owned by a close friend and supporter of LBJ, one Leroy Byrd. As to the windshield there was a signed affidavit from a high level Ford employee on his deathbed that he was instructed to not only remove and replace but to destroy the windshield in Detroit. Gerald Ford, a Warren Commission member, publicly admitted in 1997 that he had altered an autopsy drawing to move the bullet hole in JFK’s back much higher to meet the standard of the idiotic single bullet theory; look it up on Google.