There are basically three kinds of players homed on NA Dawnbreaker:
1) PvPers who play on auriel's bow( or some other server) mostly, but who like the emperor buffs.
2) PvErs who like the more sandboxy playstyle of Cyrodiil
3)PvPers who like small scale skirmishing rather than zergs.
So the gist of your point is misinformed; dawnbreaker pvpers are guesting most of the time.
No, Dawnbreaker NA is very populated, and there are a lot of PvEers there. But there are a lot of PvPers too, and those people are already guest playing on other servers. Those guesting players are a likely cause of the imbalance that allows AD to be winning in 6 out of 10 campaigns right now.
Also, all those PvErs do an awful lot to keep the Dawnbreaker map yellow most of the time. Do not underestimate the power of PvDoor.
Ok man, I am not going to elaborate the Dominion strategies to you. Dominion is crushing the other factions, and it isn't an accident. It is comprised of the same guilds who dominated Guild Wars 2.
You don't think it be like it is but it do.