Fire powers

Hi, 

To my understanding, Dawn Age Orlanthi thought Elmal was the Sun, but now in the Third Age, everyone agrees Yelm is the Sun, and Elmal is a narrow view of Yelmalio the Lightfore.

In the Dawn Age, did worshipping Elmal grant fire powers? If not, wouldn’t it have seemed weird that the fiery Sun Disk didn’t grant fire magic? 
Did the worship “go” to Elmal, who is Lightfore, or to the Sun Disk, associated with Yelm?

Thanks in advance for the clarification.