His little animation showing the bullet doing a loop-de-loop between JFK and Connally is ridiculous. The bullet traveled in a relatively straight line, having encountered no bones in JFK's neck, and in a straight line it entered Connally's back, hit several bones, and apparently came to rest inside Conally's body or at least inside his clothes.
The single bullet explanation has been much ridiculed by conspiracy theorists, but the simple fact is that it could not have entered Connally at that spot and angle except if it first went through JFK.