Internal consistency has always been more important to me than perfect harmony with previous invasions.
If you see a return character, you can count on him being the same. But if you see different NPC characters then before, you should assume they are different "people" and may well think and act differently. If you need IC reasons, we can sure make some up. Or you can.
We try to not break the storyline with the previous invasions entirely. So if you care about it, for example, there is a reason why all the blighted regions belong the Daimons now, irrespective of who had them when the last invasion ended. The reason can be found out. It may be important, or it may just be background fluff.
What is important is that we don't just make up stuff. Well, occasionally we do, like when the roleplays get into an area we hadn't prepared. But in general, things have reasons and those who interact with the invaders and in general try to find out what's going on fare better than those who grab their sword and go for it. Though sometimes "fare better" only means knowing why you die.
Our invasions also tend to have "themes". I remember the one (the 2nd?) invasion that had a bit of a silly theme and among other things we had an army of 20,000 frogs somewhere in there.
The 4th invasion had a theme of trust and betrayl, and I see that it worked so well that even with everyone yelling "invasion! invasion!", there is still no peace to be seen.
So yes, there are some inconsistencies, but there is also a lot more consistency than you give us credit for.
Certainly more consistent the the policies of any Modern Political Party. I also question how much of the apparently inconsistencies stem from not having 100% of the information from the invasions. When you only know bits and pieces the human brain will tend to fill in the rest, and it is actually quite difficult to remain objective about those bits. Its supposed to be a survival trait, been some very interesting studies about it recently.
