Koa'ki Meiru is just like dragunity, hey trunade then OTK, sure you have other ways to play the deck but the thing is Koa'ki Meiru don't have a reliable backrow remover (I prefer using ice to sandman), the bricking issue will be partially fixed with the diamond core but still Koa'ki Meiru being meta is somewhat questionable, I believe it will just like dragunity.
Not at all. this box contain wall (surprisingly R) and we already have sandman, if only guardian came, we can make the rock stun deck with ties of the brethren