I think the monsters have their turn, then the AI players in order, then the player. So it might make sense for the monsters to not move on the first turn of the game, to allow players to put down their first city.
PS: Could you please make it so a Sovereign automatically is inside his city once it is founded? This means if you need the firepower of the Sov to defend the city, you've got it, rather than the Sov standing outside watching the only city he is capable of founding going up in flames. At least we will then be able to accurately guage whether the monsters attacking on Turn 2 are survivable.
