Mr. Fords theoretically is staring to kind of mesh with Doyle’s version of Armstrongs double Oswald theory.
~Sigh~
No, it isn't!
My money is on this guy as the man who was firing from the SN window, who was encountered by Officer Baker by the rear stairs, and who shot Officer Tippit and then disappeared down the alley off Patton:

Does he resemble Mr. Oswald enough to have left some witnesses confused afterwards? Sure. But that's a world away from the Harvey & Lee stuff.
A plan that includes Mr. Oswald in the doorway waving a flag at the passing Pres. Kennedy is NOT a plan that will simultaneously have Mr. Oswald being impersonated at the SN window. All that is needed is to establish the INVOLVEMENT of the Soviet defector and Castro-supporting Mr. Oswald in the missed-shots provocation. No one would ever know the names of his 'pro-Castro' confederates on the sixth floor. Mr. Oswald had agreed in advance to carry the blame---------as the sole named participant-----------for the missed-shots incident. Once the assassination happened, this left him uniquely vulnerable. Instead of being flown out of Dallas, he ended up being arrested. In interrogation, he could do little more than stonewall with sometimes ridiculous answers ('Yeah, I brought a pistol to the cinema, because I just felt like it'), hoping the while for rescue from those he had served so loyally.
The middle-aged dark-complected man in the bright plaid shirt seen at the SN window by Mr. Arnold Rowland was there for one reason: to be
seen and remembered as a guy hanging out at the window while looking Cuban. Had the false-flag operation gone as planned, the press would have run with lurid reports of him, and others, seen on the sixth floor before the motorcade reached Dealey Plaza---------------
the pro-Castro team that Castro-loving Marxist Oswald had smuggled onto the sixth floor. And Mr. Oswald's flag-waving from the doorway would have been presented as a taunting gesture to Pres. Kennedy.
This was all about generating a pretext for C-Day (12/1/63). Public outrage. A shocking provocation justifying a robust response.
When the planned false-flag stunt was trumped by an actual assassination, however, all this stuff had to be shut down. Mr. Oswald had to be taken out of the doorway. And a witness like Mr. Rowland had to be discredited by any means necessary.
Mr. Oswald, in short, did not need to be incriminated behind his back by any impersonator. He incriminated himself willingly as a confederate in the ostensible pro-Castro provocation-----------that was an essential component of the false-flag deal.
He may even have been the man who hitched a lift from Mr. Ralph Yates a couple of days before the shooting. Given that the TSBD was facilitating the false-flag operation, all post-11/22 assurances from them that Mr. Oswald was at work at that time are less than solid. If they were working with him to facilitate the false-flag incident, he would have been given all latitude to quietly come and go as he needed. Had the false-flag incident gone as planned (i.e. non-lethally), Mr. Truly might well have been telling reporters about Mr. Oswald's having come to work late that Wednesday morning. 'I was surprised, but didn't give it too much thought at the time.'