IF Luzon and mindanao became fully islamized before spanish invasion

IF Luzon and mindanao became fully islamized before spanish invasion?
I know that parts of mindanao were fully islamized when spanish came that is why they were unable to conquer but what if whole luzon and whole mindanao(inc.zamboanga and davao) became fully islamized before the spaniards came...

I think only Visayas will be conquered by the spaniards if this is the case.
 
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