Adam is dead on in both of his posts. Saying Lewis wouldn't have been dominant without his size is just as stupid as saying the same of Ivan Calderon for the most part.

The point about divisions is a crucial one to. Guys who are huge for a weight or have a size advantage on fight night anywhere below HW, do so because they are able to shed water and rehydrate more than their opponent. Everyone is different in that sense, and obviously many guys put themselves in terrible shape doing the same thing that works tremendously for others.

To me there isn't a lot which can be done about this as far as changing the weigh in times etc. Being able to cut weight while retaining power and the ilk is down to a science just like any other aspect of elite training. If some guys are better at it then that is a natural advantage just as being faster or stronger than someone is, at least the way I see it.