if i remember correctly, blades were present in the philippines before the spanish raped the philippines.
(sorry everyone on the forum from spain, this is not directed towards you or spain in the present. i dont hold you accountable for what happened 400 hundred years ago. but, at least the spanish introduced Paella!!!! mmm mmm good
so, did the spanish steal filipino techniques, or vice versa? the malay / indo / philippine archipelego was a blade oriented society before spanish/dutch/portugese/british arrival. the philippines may have adopted some spanish fighting techniques and terminology, but i have never seen a spanish fencer/fighter move like filipino arnisador/fighter.
but as for your WWII comment, not all philippine fighting arts adopted the japanese stances. the ones that did, did so, because the filipinos were entranced by foriegn martial arts and had to adopt the japanese postures to make it more "fascinating" to the filipinos. but if you do your research and actually study with these systems, you will find the "true" filipino martial arts hidden within the system.