Something that is worth thinking about is that there are more Yelmalio initiates in Sartar (which includes Sun Dome Temple and the Far Place) than in the Civilized River of Cradles. However, whereas in the River of Cradles the Yelmalio cult can look at the Orlanth cult as a relatively new parvenu (and a near-equal), the Sartar the Orlanth cult is far more numerous and firmly established. As a result, the Yelmalions in Sartar must defend their identity through both rigorous military training and astute diplomacy (particularly with the Ernalda cult). They simply can’t be the yokel xenophobes of the River of Cradles and survive.
And the Light Captain of the Templars in Sartar is generally just known as THE Light Captain. I suspect in Dragon Pass it is sometimes forgotten that there is a Light Captain in Prax.
They brought those revelations to the other temples. Within a generation or two, all the Sun Dome Temples of South Peloria, Dragon Pass, and Prax embraced Monrogh’s revelations.
For Greg this was an example of how cults changed in history. Another comparable (actually even more significant) change was the rapid spread of the Orlanth Rex cult in the late Second Age.
The Lunars took advantage of this, and gave lands and rights to the Yelmalio cult throughout the Lunar Provinces. Ironically, the Yelmalio cult is at best Neutral to the Seven Mothers and downright Hostile towards the Red Goddess, but it is also only Neutral towards Orlanth.
The Little Sun cults throughout the Lunar Provinces embraced Monrogh’s revelations. Of course there are differences from temple to temple, and some temples have different spirits and heroes associated with it.