We have an Unknown Eyewitness standing only feet away from the JFK Limo and your response is "WHO CARES"? I contend the FBI/SS knew exactly who the Umbrella Man was. They had NO Problem running down Bob Croft in under 24 hrs. Croft was a missionary that had a layover in Dallas during his railroad trip from Little Rock to Denver on 11/22/63. He claims he spoke to no one, yet the following morning the FBI was banging on his door in Denver and demanding his film. The difference between Bob Croft and Umbrella Man is that Bob Croft had taken photos of the JFK Limo as it cruised by him on Elm St. Umbrella Man did not take photos/film. "Who Cares"? This echoes the mind set of the FBI/SS.
There were many people standing on the street that day. Many were questioned or interviewed. There is no logical reason to believe this person saw or heard anything that others standing around him didn't. In all likelihood, if he had something to contribute to the investigation, he would have come forward to the authorities as Brennan did at the scene. None of that, however, has anything to do with why UM is a person of interest after six decades. Some CTers want to link him to the crime itself as a participant in the conspiracy. The takeaway is that makes no sense and he had nothing to do with the assassination whoever he might be. As a result, his identity is a person of mere historical curiosity. Would it be better if he and everyone in DP had been interviewed? Sure. The DPD would still be at the crime scene. But the default to that, however, is not that there was a conspiracy.