User blog comment:B214/Volume 21 info & spoilers/@comment-26865730-20160408034729

Notice the Queens and Aces? Iirc: the Brave Saints also perform hands from Blackjack. Since they are based on technology patterned after Evil Peices I wonder if they found some crossover between the EP-Q and the BS-Q? Allowing a Devil Queen and an Angelic Ace to perform a "Blackjack"?

Possibly this had to be performed externally and it would leave the Queen and Ace in this reality. It would definitely be a requirement for any plan that Sirzechs would agree to. This way he knows the woman he loves will continue and Milicas will not be left alone.

After all, Sirzechs had said he would prevail even at the cost of his life... Don't remember him saying at the cost of Grafia's or Milicas's lives. :P