I saw this game, and marinelord had way more villagers for a longer time+water, what won beasty the game was more him getting relics which allowed him to easily go to imperial right after marinelord just hit castle age and from there his economy just scaled out of control even though marinelord had 2tc+water the whole game.
Fix here would be to change the cheaper cost from swabia to the other age 4 landmark from the hre. Swabia shouldnt have that kind of discount.