Well, you posted that Williams left the SN, which was on the sixth floor. Dillard Exhibit C would blow that theory to smithereens. It also appears that you have unwittingly answered your own question as to why would Williams, Jarman and Norman would have to lie. They didn't! You have taken bits of confused and conflicting testimony of three individuals and made it into a sinister conspiracy without motive. Take three witness testimonies of an event and you'll likely get three different versions of that event. I'm sure this has been repeated a million times but it's a truism that has to be brought into the discussion because CTers just don't quite get it.
You seem either incapable or unwilling to appreciate the assembled information and it?s implications.
The official story is that the shots were fired from the SN at about 12.30. At that time Williams, Jarman and Norman were in the windows immediately below. About 40 minutes later Mooney finds the shells and chicken lunch remnants in the SN. This was verified by numerous police who arrived shortly after and made statements of their observations. Someone (likely Gerald Hill) moved the lunch and eventually placed the chicken piece and bones in the lunchsack. This occurred prior to the arrival of Fritz. The lunch was considered evidence and thought to belong to the assassin. This was widely reported in the media for a few days.
Williams was aware of Oswald?s arrest when he was questioned on the afternoon of the assassination. He was aware of the importance of the 6th floor (it was the reason he was taken for questioning). He deceived and lied about his movements for the duration of the investigation. Eventually he admitted he joined Jarman and Norman shortly before the shots.
Until their WC appearance Jarman and Norman maintained that Williams ascended to the 6th floor with them. Why did they continue to lie about his movements? The timing of his descent and his position in the SN is completely consistent with the essential observations of Arnold Rowland in his WC testimony.
I am not suggesting Williams was in any way part of the shooting. Just that analysis of assembled information from official documents suggest that something other than the offical story occurred in the SN just prior to the shots.