where specifically are are those " issues and questions about that conclusion..."
Even so, it was FBI Shaneyfelt that came up with it.
DPD Officer Foster and James Teague brought them a missed shot. That was April & June '64
“They had to go back and rewrite the Warren Commission,” Tague said. “That’s where the magic bullet came from. That’s the only thing they could come up with. That one bullet went through two people.”
I already posted the quote and source note. Here is more from “History Will Prove Us Right” by Howard Willens, page 46:
The commission had earlier deferred the question whether it should issue a public statement after it had received the FBI report. Before appointing the commission, President Johnson had announced that the FBI report would be made public. Based on their initial review of the FBI report, the commission members did not wish to endorse or reject the bureau’s conclusions until the commission itself had examined the underlying materials and conducted the additional investigation necessary. Consequently, after adjournment that day, Warren told reporters that the commission would not be issuing any summary of the FBI report or any statement about it. That struck me as a wise decision. Any endorsement of the report at that early stage of the commission’s existence would have thoroughly compromised its mission, in light of the widespread skepticism about the FBI report and the outstanding questions not addressed by it. Hoover was displeased. He complained to his lieutenants that Warren’s insistence on seeing the supporting materials for the report was an insult. He described Warren’s comment as “entirely unwarranted” and could have been better phrased “so as not to leave the impression, at least by innuendo, that the FBI had not done a thorough job.”5151. Church Committee Report, 48
By the way, I have (and have read) an autographed copy of Tague’s book. Yes, Shaneyfelt did help find and document the bullet mark on the south curb of Main Street near where Tague was standing. I showed some of that work in my “The Other Single Bullet Theory” thread. But I do not believe that the idea of the original single bullet theory was first derived from Shaneyfelt’s work.