User blog comment:Kogath/Monster Hunter Generations Discussion/@comment-26532315-20160304134118

I've got a theory for the whole No-Subs-an-no-Blos-and-so-on thingy, combining both real life and lore:

Hence 4U got sold-out in some regions and was a huge success, and so many people bought it, the guild got many hunters and many hunted monsters. Thus, the Subspecies, Blos and Gravios Wyvern got overhunted, and aren't allowed to be hunted anymore. So, why Goldian and Silverlos then? Because the newly discovered Deviants invaded the Special Areas - mainly the tower - and repelled these Wyverns. So, the Silveros and Goldian were forced to move out if their territory and are a new danger for the villages.