A journey into a wondrous land who's boundaries are that of imagination
This should be the slogan for the Tinfoil Brigade.
Brennan said that he saw Oswald stand back from the window immediately after Oswald's (2nd)(his last) shot.
Hence Oswald was standing back, or had already left, when Hickey fired at Z300-Z312.
If so then we need to ignore (at least some of) Worrell's testimony re Worrell seeing the rifle.
But i dont think that any other witnesses contradict any of what Brennan said.
Re Worrell, imo he cant be classed as a witness at all.
In which case no witnesses contradicted Brennan.