Oswald obviously missed the 1st shot because his scope was grossly misaligned. The LNers seem to think he must have seen a puff of smoke where the bullet struck the pavement next to the limo and decided to use the iron sights for the magic bullet shot that entered JFK's back at T1 and out his throat at C7. Then he waited for Greer to slow down the limo to the turkey shoot point (Z313) and fired the 3rd shot with a frangible bullet that exploded in JFK's head. Oswald must have been a sharpshooter savant, too dumb to practice and sight-in his scope but quick-witted enough to improvise on the fly.
Maybe Oswald knew he was the designated patsy. Maybe he smuggled the rifle into the TSBD in pieces inside a paper bag and reassembled it without leaving a single print on the rifle. Maybe he took some shots from the SN and wiped off all his prints, ditched the rifle, bought a coke from a vending machine in the lunchroom within 90 secs. Maybe the MC wasn't leaky enough to deposit any nitrates on Oswald's face as he took the shots. Maybe Oswald was such an elite sharpshooter he could pull off a headshot using a crap rifle with a wonky scope and no practice. Maybe the magic bullet did zig-zag thru JFK and Connally and showed up on the wrong stretcher in near-pristine condition without a trace of blood, flesh or bone on it. Maybe the DPD were just incompetent with the evidence and inadvertently served up Oswald to Ruby. But none of those maybes exclude Oswald from being a pasty. LNers are actually WC Defenders, since Oswald was clearly a patsy, not a lone nut. And if the Big Event was a conspiracy, there is no way in hell they would rely on the patsy to use a crap rifle with a wonky scope to single handedly take out the POTUS. Besides, there isn't even a valid trajectory from the SN into JFK's back and out his throat. That's why the WC was forced to move the wound up his back closer to his neck to make their LN narrative plausible.