Here's a clip of John and Nellie stating unequivocably where the shots came from. There was no doubt to them, despite your suggestion otherwise.
http://mcadams.posc.mu.edu/connally.rmYou're flat wrong on how many witnesses said a shot came from the Grassy Knoll. There are 121 witnesses whose testimony is recorded in the WC records. Of those, 17 said they had no idea, 35 said a shot came from the knoll, 56 said from the SBD, five said both. And that's interesting, because everyone admits that Kennedy was shot at least once in the back. For him to have been shot in the front, there would have been shots from at least two directions. Only five of the 121 witnesses said they heard shots from both directions.
The autopsy photos are all over the net. Do a Google. Here's Kennedy in the limo not long before the shots, with his typical slouch and lean. Look at his lower neck in relation to his shoulder blades, then visualize the shot on the beck. It is about three inches from his shoulders, just to the right of his spine. The front wound was just at the bottom of his tie's knot (which is where the bullet pierced his tie).
Your comments on Lattimer are interesting, since they could be applied the other way as well. He's smeared by conspiracy buffs who can't prove him wrong. And I gave you two sources, but you only chose the one you could smear the messenger on, rather than debunking either one with evidence.
Billy Lovelady was not the witness who saw the package in Oswald's car. He was the man outside the SBD who some thought was Oswald in a picture. Wes Frazier and Linnie Randle (brother and sister) saw the package. Randle saw it as Oswald carried it from the garage to the car. Frazier saw it in the car. Neither said they paid much attention to it. If Lovelady also said he saw Oswald carrying the bag, I'm not familiar with the story. You'll have to show me where someone found curtain rods in the SBD, since the police said otherwise. (Cap JW Fritz- 4H218 in the WC papers).
On Oswald's shooting skills: "During his military career Oswald scored as a "sharpshooter" in December 1956, on two occasions achieving 48 and 49 out of 50 during rapid fire at a 200 yard (183 m) distant target, but failed to attain a marksmanship badge."