Howard Brennan got instant publicity, and did very little to avoid it
Lane made no assumption
The DMN not only mentions Brennan by name but also his occupation.
11/23/63
Assassin Crouched And Took Deadly Aim
by Kent Biffle ( Section 4-page 1 )
"There were many faces in the windows of the building. A few, like H. L. Brennan,
a 44-year-old steamfitter, actually got a glimpse of the gunman.
"After the first shot, I looked up and saw him. The gun was sticking out the window.
I saw him fire a second time. "He was a slender guy, a nice-looking guy.
He didn't seem to be in no hurry", said Brennan.
and from researcher Gil Jesus:
Brennan asked David Belin during his testimony if the Commission had the television coverage of his interview with Secret Service agents at the crime scene. Brennan's instant celebrity, his name and face, had been broadcast all over Dallas BEFORE HE HAD EVEN SEEN THE LINEUP.
In August, 1964, before the release of the Warren Report, Brennan spoke on camera with CBS News, for their nationwide broadcast, "CBS News Extra: November 22, 1963 and the Warren Report," aired on September 27, 1964. Interviews were done, according to narrator Walter Cronkite, a month before the telecast and the release of the Warren Report.
In the CBS program, Brennan blatantly contradicted his sworn Warren Commission testimony when, having blown his cover, he told the nation that "The President's head just exploded."
Brennan also posed for a photograph which appeared in the October 2, 1964 issue of Life magazine.
For a man trying to keep a low cover for fear of his life, he sure didn't act that way.
as far as " a nobody like LHO being able to pull off the assassination alone"
Go ahead and prove it - so far the only one making assumptions is you.