User blog comment:AhmaddamhA/Change in Issei's Evil Pieces./@comment-1359322-20160701020804/@comment-1359322-20160703011236

Value =/= to transforming to other Pieces especially the King Piece. If Evil Pieces can transform into other Pieces then Ise's Pawn Pieces would have transform into Queen, Bishop etc instead of Pawn Mutation Pieces. So no, Evil Pieces don't randomly transform into other Pieces. And Ajuka exposed the King Piece to Ise and the others simply because


 * 1) Diehauser is gonna expose everything soon anyway, why bother hiding it further?
 * 2) Ajuka wants to recollect all the King Pieces, so telling the young Devils the truth makes no difference to him.

As to the DxD G affecting the Evil Pieces, it might affect it, it might not but either way the King Piece is meaningless to Ise due to his Boosted Gear. The King Piece's ability is merely to augment power, it's not like it possesses traits like the other pieces.

A simple example to show how the King Piece and Boosted Gear works.

Lets say Ise's power is 10. And the King Piece can increase his power by 5 times.


 * 10*5 = 50

If Ise does that using the Boosted Gear it would go:


 * 10*2*2*2*2*2 = 320

Again this is just an example. I know the King Piece can increase 10 times more. This is just to show how the Evil Piece and Boosted Gear would differ.