My thoughts lie in the realm that a single gunman theory falls flat in view of all the wounds that the victims received. Remember that James Tague was struck by debris from a separate shot.
Quickly... http://www.personal.utulsa.edu/~marc-carlson/history/zapruder.html
In the link you provide Tague is hit well before z207. Zapruder shows no meaningful reaction from agents Hickey, Landis or Ready up to that point, who all testify they reacted immediately to the first shot, turning to look "rear right". Zapruder refutes this model. The first shot must come after z207.
At the moment I have it something like this:
1st shot - z223 - passes through JFK and Connally
2nd shot - z313 - headshot
3rd shot - ? - hits piece of concrete south side of Elm, fragment goes on to hit Tague (maybe ?)