There are no answers from you. You never answered because you can't.
Which part of my response did you fail to understand?
I can try to explain it to you in simpler language, but I can't understand it for you.
Regarding the brain, I already linked to Humes' language where he said little to no cutting had to be done to remove the brain because of the extensive damage to the skull caused by the bullet's passage through the head. Despite my linking to it numerous times, you continue to question how the brain could be removed from the skull.
And on the subject of the rifle: Quite simply, from what I cited, Klein's received an order for a rifle that was for a rifle they ran out of stock on, and Klein's was now shipping a slightly longer rifle also from Italy from the same manufacturer but a different model. They also updated the advertisement to reflect the new rifle model. Orders that arrived in the interim with the old advertisement were being shipped the new model because that's what Klein's now had in stock.
There's nothing mysterious there.
Klein's also wasn't in the habit of shipping product for free, and their business records indicate they got paid. By money order. So arguments starting with, "There's something funny about the money order and..." are non-starters because we know Klein's got paid by money order, and your arguments just reduce to nothing more than anomaly hunting once more.
The language you quoted concerning postal money orders says they should be stamped payable "to the order of any bank"' and the money order in question was stamped PAY TO THE ORDER OF THE FIRST NATIONAL BANK OF CHICAGO, which meets the requirement you quoted. It cites further requirements, but also says the money order will be accepted for payment without those other requirements being met, and the money order will be presumed to have them if submitted for payment.
Anything beyond that isn't necessary. Continuing to quibble means you simply don't understand the arguments made thus far, and your complaints are still meaningless anomaly hunting that goes nowhere, as Klein's affirmed they got paid by money order for the rifle bearing the serial number C2766.
Your failure to accept any of this does not reflect whatsoever on the state of the evidence. It reflects solely on your insatiable desire to find a conspiracy, and on your need to dismiss any evidence pointing to Oswald.
And the evidence points to Oswald (FYI - the money order you're questioning was determined to be in Oswald's handwriting, something you don't even try to explain).
Good luck explaining the consilience of the evidence pointing to Oswald.
Hank