Anything short of the event captured on movie picture film, or you being able to travel back in time to verify it personally, you don't accept or dismiss as assumption rather than a reasonable assessment of the available facts and evidence.
Why don't you simply try to answer the question instead of coming up with an already predicted diversion and ad hom attack?
When you claim that Oswald would not think the rifle was untraceable", you need to explain why he used an alias to order it.
And btw, what makes you think that the WC assumption is a "reasonable assessment of the available facts and evidence".
The mere fact that I can offer you two different explanations for the same event makes that so-called "reasonable assessment" a complete jump to a conclusion not supported by the evidence.