This from a guy who has offered no alternative explanation for how the Tague injury occurred. Why don't you give us an alternative theory wo we can compare it to the possibilities that it was caused by one of Oswald's shots. As is the custom for most CTs, you set the bar very high for the LNs and very low for yourself. We are expected to prove every last detail with 100% certainty while you are allowed to speculate while providing no evidence.
If you can, why don't you.
A number of plausible explanations have been offered for how a shot from Oswald's rifle could have continues down range and struck the curb near Tague. Posner has theorized the bullet hit a tree branch. I don't necessarily believe that but I can't logically refute it either. Others have suggested the bullet struck the traffic arm that the limo passed under. Again, not my theory but possible. I lean toward the first shot missing to the right of the limo, ricocheting off the pavement and continuing down range to toward Tague. I used a Google Earth view of Dealey Plaza and it shows a line from the sniper's nest to where Tague was standing passes through the right lane of Elm St. Still others believe that a lead fragment from the headshot passed over the windshield and continued down range toward Tague. Without knowing the exit velocity of those fragments, it's impossible to say whether or not that was possible.
Now let's see your explanations.
You are correct that a 1st shot before Z224 to the right of the JFK limo, could strike the manhole cover.
However it would have to be high above JFKs head. So that suggests an inadvertent unaimed shot fired as the TSBD shooter was in the act of adjusting the rifle on the boxes. It seems plausible enough to me but I’m having trouble dismissing the majority witness hearing the 1….2.3 pattern, and Tague seemly more inclined That it was 2nd or 3rd shot.
Seems to me improbable that an MC bullet would break apart after hitting the manhole cover such that a fragment of lead completely separated from the copper jacket and flew across to the curb, while the remainder of the bullet still in the copper jacket buried into the grass. Maybe an experiment is necessary to see if it could happen this way.
Similarly, if no copper trace element was found in the curb and only lead then does not that rule out a 1st missed shot before Z224? Unless…Maybe it hit the road and ricocheting?

Hmm…possible but It would be almost the same result:a portion of lead separated completely from the copper jacket and flew to the curb, while the Rest of the bullet with copper went into the grass ( or where?)
But if it was the TSBD shooters MC bullet surely they should have found the builet if it buried in the grass. There is no reason not to document that if it was found (unless it was Not an MC bullet?)
So this leaves the Z313 shot breaking up such that a lead fragment separated completely and flew to hit the curb. However if it got over the windshield then as Andrew Mason noted ( if his math is correct)that the fragment would only be traveling approx 200 ft/ sec ( the parabolic arc physics equation).
So… the only other possibility is a Z313 a fragment that went just to the left side of Greers head such that the parabolic arc is flattened by not having to go over the windshield, thus the fragment velocity could be much greater, say more like 1000 ft/ sec which with be enough force of impact on the curb to explode some particles of concrete.