I think Bannerlord is more of a 500-750AD rough time period with Warband being a 1100-1300 time period.Clearly you haven't studied India mate. Besides if Bannerlord is set in the historical timeline 1000 ad- 1100 ad then the Aztecs are 300 ish years down the line, so definitely Mayan is possible but not the Aztecs. But then again its a game and we shouldn't get too worked up about it.