Board Thread:Questions and Answers/@comment-5693502-20140410203934/@comment-5693502-20140416162753

I see you haven't made a point on the larger portion of that post. Also, and I've rebutted this point above, but since you're classing Kido as a Soul/Shinigami exclusive ability (which I also agree with) I will once again say, Hollows are Souls (albeit without a heart). Thus, Arrancar are merely (Hollow) Souls with a Shinigami-like existence (similar physiology, as noted by Uryuu, and a zanpakuto, even if functionally different) making them that much more similar to a Shinigami. All of this, combined with the points about how a being achieves the ability the use Kido, makes it seem at least possible that an Arrancar could learn how to utilize Kido. Not saying they can, just saying I think it would be possible.

This is only a hypothetical question from which we will most probably never ever get an answer straight from the horse's mouth, similar to if I asked, "Does Ichigo have the potential to use Vollständig ?" Also since this question is harmless speculation at most, I doubt anyone is going to mistake this for factual information (especially considering that the people who have commented so far don't sound stupid).