CK2 will use the same engine as Sengoku, EU3 and V2. Why does the multiple flank combat need to be exclusively for CK2? The argument that the character side of the game is shallow because it concentrates on warfare doesn't really fly when the combat is just as shallow. The fact that they have demonstrated they can make combat better but chose not to include it again makes it feel like Sengoku is CKs poor cousin rather than a game in its own right.