Super write-up so far, thanks

I'm Man btw and I appreciate being able to look at the game from this perspective. I am very new to the game and some concepts still elude me.
For instance: Atlantis definitely has not done much. He is sitting down in the corner with ~150 troops and a pretender. I feel like I should be more worried but I just swept through the independents in the SE and left the water alone for now. I did start building more temples in that area as his dominion keeps rising. It has spread to the NW a bit and is getting stronger. Is this something I should be worried about? I keep meaning to pull out the manual and look closer at the dominion section.