This thread is just another sad example of the refusal of WC apologists to see what is so plainly obvious. Witt's account of his alleged actions markedly contradicts Umbrella Man's actions seen in the photographic evidence, not to mention that his account raises questions about his sentience and comprehension.
This wasn't the WC; this was the HSCA that came to the conclusion that Witt was not involved in the assassination. What the WC had to do with this issue is irrelevant.
You said in your original post that you rejected Witt's explanation that he waved the umbrellas as a political act, a heckling of JFK, because there was no evidence that the umbrella was used as a political symbol. And because of that, i.e., no evidence that it was used this way, his explanation was false.
Several posters have shown that the umbrella was indeed used as a political symbol, as a "heckle" of those who supported the appeasement policies of Chamberlain. People like Joe Kennedy Sr. LBJ, in fact, mentioned "umbrella man" in a criticism of JFK's father directly and JFK indirectly. Again "umbrella man." Another poster showed that some German students sent JFK umbrellas in protest for his perceived inaction after the Berlin Wall was put up. Et cetera, et cetera.
So do you still believe that there is no evidence/history of the umbrella being used as a political symbol or protest symbol? If you don't then your original claim mentioned above essentially falls apart.
Second, where we these sniper teams that Witt was signalling located? What is the evidence for them? Who said they saw sniper teams located around the Plaza? Could you flesh this out?
Third, who ordered Witt to do this? Where was the planning done? What is the evidence for him in doing this? Simply waving the umbrella?
What you've done here, frankly, is classic JFK conspiracy thinking. That is, find an odd piece of evidence and weave that into your preconceived conspiracy explanation. Based on little more than conjecture and supposition.