Aslan, I agree with you that the blade is Maranao. The okir on the hilt mounts also look Maguindanao or Maranao (sometimes difficult to tell being next to each other).
Kai, sometimes Maranao scabbard wrangka tops have this older form that is similar to the Sulu versions.
Congratulations on a great piece and growing family of great kris!
My request: would you post closeups of the 3rd and 4th kris hilts please? (3rd and 4th from the top)