Every other employee at the Book Depository knew that JFK's route took him past the Book Depository, so it's not credible that Oswald didn't know.
You have already answered why Oswald would not be interested in shooting Stevenson and Stevenson didn't drive by Oswald's place of work on a route published in the newspapers.
Nixon was attending the annual convention of the American Bottlers of Carbonated Beverages as an attorney for Pepsi. He didn't drive by Oswald's place of work on a route published in the newspapers.
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