See, that’s a strawman. It’s an extrapolation of my statement in which my observation leads to an absurd situation that you then challenge.
As I understand it (and, as always, I’m prepared to be corrected if mistaken), the agents you were referring to were like your uncle in that they were looking at the event after the fact and reacting to things they thought looked suspicious. That’s all well and good, but lots of Americans have done the same, and it has a basic flaw - it involves cherry-picking details that support your suspicions and ignoring details that don’t.
If any of these agents were on duty in Dallas at the time, then their direct eyewitness details will carry more weight. Hence I asked “How many of these agents were on duty in Dallas that day? [If any of them were, did they] testify about their suspicions?” (altered for clarity)
The website you linked to names six agents, but doesn’t have any detail about what, if anything, they personally witnessed. The author of the website could easily be operating from selection bias - he focuses on the six agents he communicated with who suspect a conspiracy and ignores a possibly much greater number of agents who told him there wasn’t one or who didn’t bother to respond to his inquiries.
It is certainly possible for a Service agent to have evidence of a conspiracy even if he wasn’t in Dallas that day. Did an agent ever step forward and testify, for example, along the lines of:
Agent: Senator, on November 12th, I was at a meeting with my supervisor finalizing the motorcade route. I expressed misgivings about Elm Street and he said, and this is as direct a quote as I can recall, “No, it’s fine, it’ll give Lee a good line of sight, er, ah, never mind.” I thought it strange at the time and made a note of it. Three days later I was recalled to Washington to consult on an ongoing counterfeiting case and when I’d heard over the radio that the President had been shot, my thoughts immediately went to my question about Elm Street and I commented to a colleague. It was only later that I found out that this is where the fatal shooting had actually occurred.