I haven't seen any actual information on this except what I have been told.
Do robber hideouts spawn from capital village Offence + Defence points divided by a certain amount and that is how they spawn? E.g Teuton clubswingers TK would spawn less than what a roman hammer with EC Imps would spawn.
Also another quick question: I have seen normal Natars at WW but not in a speed server, does anyone have screenshots as a rough idea?