Yep. Could have, might have, should have.
But still no proof.
And no proof that it wasn't.
Well, I can't prove the Lord didn't create the earth 6000 years ago, complete with artifacts giving the impression it's billions of years old, either.
I can't find any evidence to support that conclusion, either.
Are you just being intellectually honest? Is that all you're doing, or have you ruled out a conspiracy altogether?
Do I think it's possible Oswald had help in the planning and execution? Sure. Possible. But nobody has ever been to prove that. More than one gunman? Could be, but where are the bullets?
Now, I understand there are some parts of the official explanation that seem implausible, say the single bullet theory. But I'd still have to say the single bullet theory is a lot more plausible than any conspiracy theory I've heard.
And that's my problem with the conspiracy theories - every one of them that I've heard requires at least as big a leap of faith as the Warren Report does, and usually then some.
I finally came to the conclusion that for all it's flaws, the Warren Report was at least as plausible as any conspiracy theory I've heard, and more so than most. And further, it offers the simplest explanation of the available facts.