This bullet did all this with having virtually no damaged being caused to it.
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You're repeating another MYTH, the bullet was totally consistent with the damage done.
Modern forensics have re-created the shot using cadavers models (gel and bone) and the bullets are consistent with the damage done to the "magic bullet" For the record here is the "PRISTINE BULLET"
Not so pristine is it? Nothing like the unfired bullet that was laid on the stretcher in the movie JFK.
As always, when these LIES are put under the microscope, they are proven to be lies, even when using modern science and re-creations. There is nothing "magic" nor "pristine" about the bullet, it is simply a LIE.
Oswald being the shooter does not preclude a conspiracy, although probably the sort of Grand Conspiracy, that folks seem to like. He could have had help, he could have been sent back to the US by the Soviets for such a purpose. Those things can't be proven by forensics. But more likely, he did act alone, simply because he didn't need any help, not even logistical, to do what he did.
Same with Hasan, he probably got "inspiration" from off shore, but it seems he was helping them, with $$$, they weren't supporting him. It is, of course, still possible that he was directed by his overseas contacts. Being in the army, he had access to the post, and being a citizen with a clean record, to any federally legal weapon whatsoever. I'm glad he didn't pick something even more lethal on a hit by hit basis.