I have to say, I find the skull expansion theory to be interesting.
DHT is the only semi-proven reason for male pattern baldness, but most exprets agree that it is not the "whole story."
The skull expansion theory is the most interesting because it incorporates the role of DHT. DHT alone does not explain why, if all of the follicles on the top of our head are susceptible to irritation by DHT, why do men consistently start balding at the hairline and/or crown? Why would DHT affect the ridges of the hairline first, and then slowly work its way backward towards the crown? Why would the follicles on the side of our head be /completely/ resistant to DHT?
My biggest reservation with the skull expansion theory is that it does not address why hair that is surgically transplanted from the sides of the head to the top of the head remains resistant to "skull expansion"? Could it be that /any/ transplantion simply remains in place because no more expansion takes place? Or could it be that the follicles are resistant to DHT?
Let's not just laugh at/bash theories like idiots. Let's throw out intelligent questions and facts that either prove or disprove them.