From what I've learned and understand about that incident, there isnt really a real proof about the mastermind but the suspect is Ferdinand Marcos or is either his wife, Imelda Marcos
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Additional: I totally agree with the first answer but for me, when I look closely, Imelda is the mastermind since I've heard that Imelda is mostly one who changes Marcos' decision quickly. then Marcos then orders a few men in shooting Ninoyn
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but is it, really?
That's was what the rumors and most people said, tho it is not proven, that's what they suspect.
I wouldnt say my answer is a hundrend percent correct tho. It's just base on my learning.
yep.that is my answer too