Responses

Read their religion's lore about the angel of judgement and the first holy king Zion. It's a huge hint on what Parvelone's destiny is and why he's not revealing his secret to Sion(he thinks Sion will try to stop him). He also thinks him medling with "god's chess board" in the last timeline was what lead to Sion's demise.
I mean. I know it's for dramatic story telling and all but I also don't really get why he hasn't told Sion he knows it's him and he's regreased as well