I have a background story sorta, focusing on Ichigo's fear of his hollow and how Zangetsu despises him for that, which lays ground to most of the fighting. I have put a lot of thought into syncing lyrical content of the song to what shown in the video, and it really helps if you know English well enough to hear what's being sung as I think some scenes become more powerful if you do. The name is meant to function as a double entendre both referring to Ichigo's hollow (the obvious) and the feeling of being hollow (the understood afterthought meaning). I think the latter intention will be more obvious after watching as much of the AMV's focus lies on fighting oneself. This is the interpretation that I truly infer to.