Why do you insist on permanently displaying your ignorance?
Nobody ever connected the bullets taken from Tippit's body with any weapon.
Don't mistake your flawed opinions for actual proof, as the two are worlds apart.
As he says from the far shores of the lunatic fringe
Oswald connected somebody's bullets to Tippit's body, and then had the effrontery (and downright bad manners, if you really must know) by not even asking Tippit how things were going before he himself pulled the trigger on his own patience and somewhat prematurely applied the zombie-snuffing 'double-tap' finisher technique to the noggin.