This has been the most difficult set to guess any player so far, need more info, but for now I have Heartt vibes on Koshrau, he picked Arabia and civs like Mayans, Japanese and Aztecs that I can see being picked by him. Plus his gameplay is not as polished as the big names with the autofarming in 1st game and careless with vills walking around the map in the 2nd. And I have no idea who Sigismund can be, Im totally clueless.