You have a good point and observation. I believe that maybe there was more than one gunman but at the same time no one has proof of that and people heard the shots from the building that Oswald was in. But I believe Oswald was only a decoy. Take a look at this article before I say any more to make my point. I have more evidence as well. Skip down to where it talks about the assassination with Kennedy. There is fingerprint evidence mentioned in this article as well.
http://spartacus-educational.com/JFKwallaceM.htm
The Mac Wallace myth
From Faustian Bargains
by Joan Mellen
JFKFacts
October 12, 2016
[Excerpt]
Fingerprint
Mellen?s biggest service is to revisit the story of an unidentified fingerprint found on a box on the 6th floor of the Texas School Book Depository. Numerous JFK researchers have repeated the claim that the fingerprint was that of Mac Wallace, an LBJ associate who apparently murdered a man whom he believed to have slept with his wife. As Mellen shows with a careful reconstruction of the case, Wallace escaped punishment for the crime thanks to legal machinations of Texas politicos aligned with LBJ. From these events arose the hoary legend that Mac Wallace had something to do with JFK?s assassination.
Mellen kills the legend. She points out that the two ?experts? who said that fingerprint came from Wallace were not certified identification experts at the time of their claims. They also used a faulty image of the fingerprint. She notes that the JFK authors who repeated the story of the Mac Wallace fingerprint often used identical language without ever bothering verify the claim.
By contrast, Mellen did the due diligence. She obtained a quality fingerprint image from the National Archives and showed it to an accredited expert, Robert Garrett, without disclosing the issue at stake. Garrett stated, without qualification, that the fingerprint does not match Wallace?s. Mellen reproduces his methodology. The Mac Wallace fingerprint myth has now been definitively debunked.