Long term memory loss or not on the old board before it was taken down?
That list was picked apart and destroyed several times. Usually popped up after some LN's mountain-of-evidence got flattened.
The point about circumstantial evidence is that each piece by itself means little. It is the collective effect (including even weak pieces of evidence) of all these circumstances that proves the case. The question is: is it possible that there could be an innocent person to whom all these pieces of circumstantial evidence point? The actions of Oswald immediately after the assassination are key pieces of evidence. The answer that most reasonable people who have examined the evidence is "no".
You do not attack circumstantial evidence by raising doubts about individual pieces of evidence. There is just too much of it in this case to succeed in doing that. You do it by showing that the circumstantial evidence is consistent with an innocent explanation.
And you, apparently, as if that was evidence of anything.
It is not evidence of anything except that three people who had the greatest interest in convincing themselves that Oswald was innocent could not reach that conclusion from this evidence.