No one is asking anyone to do any field research. You can state any theory that you wish, but if you want it to be taken seriously i am afraid that you must provide at least some credible sources to support your theory. This is not necessarily "scientific" evidence, it is merely providing viable support for an idea that you expect other interested and often knowledgable students to take seriously. I could just as easily suggest that the origins of the keris lie with visiting space aliens from the Rigel 5 star system (yes, it's the dreaded Space Alien Theory

). Without providing any support for this far-fetched theory it is no more or less viable then your own.