Since JFK's speech at the Dallas Trade Mart wasn't booked until November 14 and Oswald started working at the TSBD on October 16, do you think the bad guys decided shortly after June 5 -- when it was decided that JFK would visit Texas -- to put Oswald in the TSBD and hope that not only would there be a motorcade, but that it would go to the Trade Mart rather than to the Women's Building at the fairgrounds?
Or were the bad guys just fortunate that self-described Marxist (and therefore frameable) Oswald was already in place in the TSBD when the Trade Mart commitment was made?
The timing of Oswald's employment at the depository is potentially the weakest aspect of any conspiracy theory.
However, the route being published mid Nov does not preclude the possibility that it was planned well before then. June to October is plenty of time, and I would imagine they would like to plan as early as possible for all the logistics.
Trade Mart was officially chosen on November 15, but whose to say it was not pencilled in much earlier?
I found this: The earliest known date that the Dallas Trade Mart was seriously considered as a possible luncheon site for JFK appears to be mid-to-late September 1963