I can't find any Demonologists in my game!
But I agree that Paladins and Inquisitors are pretty much a given in any team (I take the point about Inqis losing their value later in the game though). Red Dragons are supreme if you can find them on Verona as I did. A couple of eggs can be swiped in Shettera too. I'd say at least 50% of KB players love Royal Snakes, and I'm one of them, but I have stopped using them now in late game. Archmages and Druids are also very nice. Royal Griffins too. Those are my core units.