Board Thread:General Mod Discussion/@comment-27461336-20180412143936/@comment-26363252-20180416200731

Because that's not how it works. The  associates an entity model with a another map, which is used to tell the game how to render custom armor models. When  is first called for a specific ModelBiped, it has no value (or null) associated to it, that's why we need to add all the custom models for every armor to the . We can't do that during the mod initialization because the  map is completely empty when the game starts.