Sun King here is something for you to take a peek at it. It is the Autopsy report of Lennon.
Notice the side of where he was shot and how the exit wounds were reported and viewed.
Chapman was on the right side of Lennon!!!!!!!! Therefore he could not have been the shooter. If this is true, then Chapman got set up!!!!! by someone else and I bet you who that might be.
If this was done by someone with some CIA experience you only need one shot to kill someone. This incident was done by a very inexperienced individual, who literally emptied out the gun in the effort to get John down.
John Lennon was able to run to the stairs (but collapsed) while being shot in his effort to go to some safety. There is a drawing herein this report.