I just can't see Ward lasting against AJ, Ortiz or Wilder for over 5 rounds. Strength, weight advantage, bone structure and density as well as speed.

Ward may just be talking. What I have come to understand in the heavier division it is about bone structure and bone density, which helps to absorb punishment and be stronger to dish out punishment. Ward is a good Super-Middle, and would have been a dominant Middle if he decided to fight there.