Fate/stay night

[Board of Command]

Without knowledge of Archer being Shirou, Archer using a variety of weapons doesn't mean that he's creating them. At the time, it seemed like it was simply part of Archer's noble phantasm, him being able to access some shit that stored all his weapon's and he merely had the capability to summon them. And that Shirou uses the same weapon doesn't mean shit. Shirou had been copying weapons he had seen before, like him creating Sabers weapon. He doing so doesn't mean that Saber is Shirou. Mere coincidence.

I always thought Shirou copied Archer's weapons because he thought they were powerful, not because he is Archer. He only started imaging those two swords after watching Archer fight using them.

If he had created those two blades by himself before Archer fought Berserker, then that would be considered obvious.