User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-2214216-20131122145056/@comment-11537809-20131122170126

This may not be the answer to all of these, but it may be because the hunters were trained to be able to survive or lift massive weapons. I doubt that they just spontaneously became hunters. There must have been some sort of extreme training that every hunter must do. Add this with what you said about wyverians and how they may be hybrids and it sounds much more likely but I doubt EVERY hunter would be a hybrid. I am not knowledgeable enough to give a reasonable enough theory for this but someone else might.