From what I have read, the sixth floor shooter was fabricated. Using the manlicher rifle LHO was supposed to have used, it would have been been impossible to get 3 shots off in the amount of time LHO had. And, there are many who say that LHO was outside the Texas School Book Depository bldg. when the active shooting occurred. I believe that there may have been a shooter from the Dal Tex bldg and a shooter from behind the picket fence up on the grassy knoll. And, there could have been 1 or 2 more shooters.