Out of curiosity, why? What possible evidence do you have against it? Or is this just a statement of your lack of warm fuzzies for the view?
This statement presumes that there is one 'the Buddha' that experiences one of the worlds and not any of the others. This is not what MWI is all about. That would be a supernatural philosophy, otherwise known as religion. Wrong forum to discuss that.
Under MWI, all versions of a person are self-experienced (and yes, none experiences death), and there is no epiphenomenal entity that 'follows' one of them.