From what I read before Lowland Luzon got gradually converted by the Bruneians sometime after the Sack of Tondo, although it took years for them to do it, which was gradual by sending missionaries in that area, is it possible for Visayas to get Converted by Brunei and Sulu or Brunei and Sulu needs to stop slave trading Visayan slaves in Visayas in order for Sulu/Brunei to islamize Visayas.