Yes, Aynesworth was one of the reporters Brennan was trying to avoid. In Brennan’s book he specifically talked about a television crew. And Aynesworth hitched a ride with a television crew to the Tippit murder scene. So it all fits.
The thing about Brennan's gho$twritten book (that was published some time after his death, and therefore wide open to 'enhancements' at the whim of the writer, despite Brennan, apparently, signing-off on the original manuscript), is that in said book 'Brennan' wafts poetically about his or soul (or something) in describing the red plume (or something) around Kennedy's head.
The trouble is that in testimony, IMS, Brennan said he was unable to see Kennedy during the head shot, that an obstruction of some sort blocked his view.