My favorite part is when the ballistics expert says that a bullet couldn't have come from the Grassy Knol because it would have exited the left side of his head and hit Jackie. Of course, ignoring the possibility that a exploding/frangible bullet was used. Some have even speculated that the Knol shooter(s) were ordered to use exploding/frangible bullets to prevent Jackie from getting hurt.
Of course, that assumes the shooter(s) on the knoll were
(a) actually there
(b) such crack shots they couldn't miss the president's head by an inch or two and hit Jackie instead
(c) confident that they wouldn't be captured
(d) confident that a shot from a right-front would be covered up
Arguing from what "Some have even speculated..." isn't a great approach. Some have even speculated that this approach allows one to introduce all kinds of accusations into the record with no evidence, and with no need to defend said speculations.
James Tague got hit with a fragment of something (he also swears that it happened after he heard the second or third shots). How could he, of all people, be hit with anything from a missed shot if it was aiming at such a steep angle?
Who said it was from a missed shot?
Conspiracy theorist Josiah Thompson in his 1967 book, SIX SECONDS IN DALLAS, thought he had answered this question for all time with his pointing out some of the facts:
(a) The metallic smear on the curb near Tague was found to be lead with a trace of antimony when analyzed by the FBI.
(b) Oswald's bullets were copper-jacketed, but the internal portion was comprised of lead with a trace of antimony.
(c) The bullet that struck the president in the head from behind broke apart. Two portions of the copper jacket were found in the limo after the assassination, and these fragments were traceable to Oswald's weapon, to the exclusion of all other weapons in the world. Most of the lead portion was not accounted for.
(d) It's nearly a straight line from Oswald's window to the President's head at Zapruder frame 313 to the curb at the spot it was struck.
All those facts - and they are facts - taken together appear to indicate that the missile that struck Tague was a lead fragment that escaped the limo. The Harper fragment (a portion of the President's brain) was found after the assassination forward of the limo as well. That would tend to show a bullet fragment could, would, and did travel in that same direction from that same hit.
I'm not certain Thompson pointed it out, but on the day of the assassination, Tague and one law enforcement officer lined up the curb mark with where Tague was standing, and determined the source of the shot had to be one of the buildings at the corner of Elm and Houston.
Buddy Walthers testified to all that. Maybe that's part of the reason he's "a person of interest" to conspiracy theorists.
Mr. WALTHERS. That's right--in this lane here and his car was just partially sticking out parked there and he came up to me and asked me, he said, "Are you looking to see where some bullets may have struck?" And I said, "Yes." He says, "I was standing over by the bank here, right there where my car is parked when those shots happened," and he said, "I don't know where they came from, or if they were shots, but something struck me on the face," and he said, "It didn't make any scratch or cut and it just was a sting," and so I had him show me right where he was standing and I started to search in that immediate area and found a place on the curb there in the Main Street lane there close to the underpass where a projectile had struck that curb.
Mr. LIEBELER. Would you remember that man's name if I told you or if I reminded you of it?
Mr. WALTHERS. I'm sorry--I don't know if I would remember it or not.
Mr. LIEBELER. There is a man by the name of Jim Tague [spelling], T-a-g-u-e, who works as an automobile salesman.
Mr. WALTHERS. I remember he had a gray automobile---I remember that very well.
Mr. LIEBELER. I think it must have been Mr. Tague because he was in here this afternoon and he told me his car was parked right there at No. 9 and that's when I put the mark on the exhibit and he walked up there and talked to a deputy sheriff and he looked at the curb.
Mr. WALTHERS. Yes; this was pure ignorance on my part in not getting his name---I don't know---but I didn't.
Mr. LIEBELER. I think it is pretty clear it was Mr. Tague, because his testimony he gave today jibed with yours and it couldn't have been anybody else and he had a cut and some blood on his face.
Mr. WALTHERS. Well, at the time I wasn't interested in whether he was cut
or what, I just said, "Where were you standing?" In an effort to prove there was some shots fired, and after seeing the way it struck the curb at an angle---which it came down on the curb---it was almost obvious that it either came from this building or this building [indicating] the angle it struck the curb at.
Mr. LIEBELER. When you say this building or this building you are talking about the School Book Depository Building or the building immediately east thereof, across Houston Street?
Mr. WALTHERS. Yes; and I ran right then back up along in here and that would be right at the corner of Elm and Houston, where I ran into one of our deputies, Allan Sweatt, and told him. everybody still at this time was just--I don't know what you would call it--just running around in circles you might say, and I told him, I said, "A bullet struck that curb. It's fresh---you can see a fresh ricochet where it had struck," and I said, "From the looks of it, it's probably going to be in this School Book Building"...
http://jfkassassination.net/russ/testimony/walthers.htm
Hank