I think the dispute is more about interpretation. Ultimately, what I've shown is more of a perspective (one I believe it's useful due to the legal interplay of rights that happen inside), but one can just look at corporations by looking at their members, agents and the rules they've agreed prior and I suspect it would be equivalent to treating corporations as real people, presuming jusnaturalism.
Given that voting is a right currently derived from a more juspositivistic perspective, the justifications behind who's considered a "natural person" and who gets to vote are pretty arbitrary.