The Mongols seem to convert to the religion of their conquered people fairly readily. Would it be possible for them to have become Buddhists and promote it throughout their Khanates? I'm not saying using Buddhism as an ideology for conquest, more of as a means to unify their expansive empire. It's been observed that Buddhist despots tend to get seriously obedient subjects, ie Thailand, Tibet, WWII Japan, etc.
Perhaps Genghis grow more appreciative of the Tangut culture?
Perhaps Genghis grow more appreciative of the Tangut culture?