Hey I'm new, but correct me if I'm wrong....
No one ever made any mention of The First having influence in any other dimension besides Earth. So wouldn't that make The Wolf, The Ram, and The Hart stronger simply because they can influence multiple dimensions (ala Pylea or references by Illiyria)?
Maybe a dimension, in the Buffyverse, needs good and evil to be created. It is a balance. But maybe every dimension has its own First. The truly powerful beings can influence and shape other dimensions besides their own.
P.S. Why can't I put demon-Giles as my icon?!?!?