the future mod vs the caveman to cosmo's mod

[Civ4newbie]

how many of you played and/or designed/modded the future mod and/or the caveman to cosmos mod? I have played both mods and I remember reading somewhere on the future mod section of the forum that the future mod had a true "dark age/era" in between the Renaissance and ancient era. it wasn't even a era in the game and you accessed it some how after you had enough acient advancements I think do any of you agree for those that have played the future mod and/or caveman to cosmos that the future mod has a more realistic representation of a true "dark age" then the caveman to cosmo's mod despite caveman to cosmos having more units, buildings and features? in real history Europe had a dark age after the roman empire was destroyed and left to ruin sometime in the 400's A.D after the dark age in Europe passed then Europe reached the high middle ages and then the Renaissance. I do not know if the rest of the world outside of Europe was in the dark ages after the roman empire was left to ruin. I think history should be important when designing or modding games like this