[Zeldor]

You also forget about big difference between attacking and defending. Also there are things like remote spells that can devastate every army. Also it would probably take around 10-20 turns for every player to move their armies to provinces neighbouring isle [and some gateway would have to be shared]. I don't think that whole thing would be possible to do in less than 20-30 turns total. And that would weaken Machaka, as they are not astral nation and they wouldn't be able to teleport additionally recruited troops in that time.