Oswald and the Kennedy Assassination

The House Committee concluded that Oswald was involved in the Walker shooting, but also that they concluded there was a conspiracy in the Kennedy assassination. How do those two things square? You'll recall that Walker's friend and the 14 year old neighbor both said that they saw two suspicious men around the time of the event. If it could be shown that Oswald had associates in the attempt on General Walker, they would be likely candidates as the grassy, old gunman. So kudos to the House Committee for providing more detail.