Deadliest Warrior is pretty ridiculous anyway. The way they categorize and compare weapons oftentimes seem completely arbitrary.
The U.S./Russian Special Forces one was pretty ridiculous, where they tested a US grenade in open air, then threw a Russian grenade in a dryer and concluded the US one was better since the explosion covered a wider area since it wasn't in a dryer.

I always though Samurai Armor was Banded Mail, thin strips of armor bound together by leather cords. Also, samurai were an elite class of nobility, like Medieval Knights. When the Tokugawa Shogunate took control in the early 17th century, firearms had replaced archers and peasants were not allowed to own weapons. In Japan, defense never really caught up to offense, and the scarcity of raw metals only exacerbated that.

As far as I know, anyway.