It shouldn't whitstand, really. Not saying you're an idiot

, but this pretty much proves Reiko is best buddies with Daegon (as much as 2 warlords can be).
The fact that he was a member of the BoS thousands of years ago doesn't really matter. It was only mentioned that he followed Shinnok in the first war against the gods.
That can't be retconed. When these writers take Reiko, what do they actually take to write about? They read his bios, his story and ask the creators what their future plans for the characters are. And they start working from there. If they don't take Reiko as a loyal General of Shao Kahn's army who hates Quan Chi and fought for Shinnok 10.000 years, then what's left? They might as well have made him a wrestler from Earthrealm

)))
I really don't get why people think about retcons all the time. Some things are just forgotten by the writer team and that's why they don't make sense, but it doesn't mean they chose to retcon it on purpose. They just screw up sometimes and it's up to us to fill the blanks. That's why I said that the first Mileena was killed before the creation of the second clone.