i dont see how Darkest Hour is metalcore. they worship at the altar of Dark Tranquility/At The Gates-style melodic death metal. Unearth is the best example of metalcore i can think of...or Kilswitch. Darkest Hour don't do that style.
Circa Survive,Title Fight 11/11
Jessica Lee Mayfield 11/18
Russian Circles,Mutoid Man 12/11