I already explained how that could happen acoustically. Supersonic ammunition with a noise-suppressed rifle shot can confuse where witnesses will determine the origin of the noise.
LONG ANSWER:
Still makes no sense for the following reasons:
1. There's no evidence of a noise-suppressed rifle shot.
2. No witnesses saw another rifle other than the one in the sniper's nest.
3. Your argument is that the witnesses wouldn't hear these "noise-suppressed rifle shot(s)", that's why they thought there were only three shots.
4. You're left with the witnesses hearing only the three NON-noise suppressed shots and therefore confusing the source of the three NON-noise suppressed shots.
5. It doesn't explain why almost ALL of the witnesses thought the three non-noise suppressed shots they heard ALL came one source, but generally named two different ones: some witnesses thought ALL the shots came from the Grassy Knoll, some witnesses thought ALL the shots came from the Depository. Only less than a handful (less than five) of witnesses thought there were two sources. Your argument relies on the vast majority of witnesses being reliable when you want (when they named the grassy knoll), but yet somehow unreliable when you want at the same time (when they heard only three shots and when they thought all the shots came from only one location).
Apparently some hunters use this to their advantage, because it works on animals.
"Apparently" is a dead giveaway you still don't understand acoustics, rifles, bullets, or shooting. You're not arguing from personal experience, you're arguing from what you surmise.
The bullet travels faster than the speed of sound, therefore the animal doesn't hear the shot that kills it.
Your faked inability of understand a simple point is not a contradiction.
STILL PART OF THE LONG ANSWER:
Your problem is I do understand your point, and can see right through to the other side.
1. Where's the evidence of a noise-suppressed rifle being used in Dealey Plaza?
2. You beg the question of a noise-suppressed rifle shot (or shots) to argue for more than three shots from Oswald's NON-noise suppressed rifle, to explain why about 90% of the witnesses heard only three shots.
3. Having used the argument that the witnesses didn't hear the "noise-suppressed rifle shot(s)", you cannot use these shots to claim they confused the witnesses as to the source of the shots they did hear.
4. You're left with arguing the witnesses confused the source of the THREE NON-noise suppressed rifle shots, all fired from the Depository, and some thought they all came from the Depository, while others claimed they all came from the knoll.
5. You then somehow claim the knoll witnesses are reliable, when you actually just established the exact opposite.
SHORT ANSWER:
You just admitted that rifle shots can confuse witnesses as to the source of the shots: "Supersonic ammunition ... can confuse where witnesses will determine the origin of the noise." (You haven't established this is unique to noise-suppressed shots only, so I left that part of your claim out).
We're done here. The witnesses are unreliable as to the source, you just admitted it. Since there's no evidence of shots from the knoll, other than the witness reports, we can discard those witnesses as mistaken (i.e., "confuse[d] ... [as to] the origin of the noise").
You know what is a contradiction? A photograph showing a five-inch empty skull cavity.
Why are five inch holes in the head a contradiction? How'd you determine that empty skull cavity was five inches?
An entry wound nobody at the autopsy ever saw.
Except the autopsy report notes two entry wounds, both in JFK, both inflicted from above and behind.
A small hole in the forehead above the right eye that everybody but the autopsy doctors saw.
Who is 'everybody'? Every conspiracy website you consulted?
An exit wound in the throat small than it's entry wound in the back.
And this is a problem why? This never happens? Ever?
The most revealing autopsy photographs going missing while the most ambiguous ones survived.
Wait, what? How do you know the most revealing autopsy photos are missing, if you never SAW them, and therefore can't speak authoritatively about what's contained in them? Your arguments never make any sense, but they usually take a little more unravelling than this.
The doctors changing their story, on one case in the middle of being interviewed, about when they discovered Kennedy had a small bullet hole in his throat.
It's called faulty recall, and trying, 35 years after the fact, to reconcile facts you're being told are true, but that you have no way of verify but accept on faith. You remember one thing, but are being told that can't be right. So you then admit you must be wrong, and change your story.
This has never happened to you?
Hank