User blog comment:Kaboto Leafgrinder/The Corporeal Beast Paradox/@comment-24163067-20140327154550/@comment-11555902-20140327155317

That is very unlikely, at this point the Adventurer has gone to every inch of Gielinor and been everywhere. It would be extremely hard for people not to see him/her at least once in their life, or heard about the many great things hes done. People like Meg idolize the adventurer before she even met him and heard about all his stories. This is also the case with many other NPC's, who have all heard of the great adventurer and the things he/she has done.

It brings me back to my first point, The Dark Energy Core, along with the Corporeal Beast, it seems almost impossible that the could not be more than one adventurer.