Chaos: Might be a farfetched call, but for one I guess I can relate the "someone who has a great power but does not know why they do" with Touma and Accelerator. Kamachi seems to be picking on the issues of "You have power, but for what reason?" purposefully as it reflects the current state of character for these two.
Thinking back on it, on a slightly novel-unrelated note - there's a track in the first OST called "Great Power." I guess we could try listening to it while reading that paragraph in question for some extra effect on our brains
