If we take the MM being a dream theory into consideration, then that would explain the Iron Knuckles in Ikana. I personally don't believe in this theory, but that could be one explanation as to why they are there if MM really was Link or Skull Kid's dream.
I and plenty of others have made general posts like this in the theory section. I get what you're saying, but I really don't think this up to you to judge.
How should it not be in the theory section? This is a topic for people to discuss their theories regarding the Iron Knuckles origins. I'm sure this is up to the staff to decide, and it's cool if they move it, but you're not staff, are you?
What IS an Iron Knuckle? Where do they come from? I was reading online and one site said that they were knights appointed by the King (and we can assume that King is Ganondorf, based on the Iron Knuckles hostility). So are they Hylian soldiers who have been manipulated by Ganon and turned evil...