I don't see any replies to your question yet, so I'll take a stab at it. It looks like you CAN edit the profile for William Aaron Brooks (at least I can). Just click the Edit link at the top. When I edit someone else's profile, I usually make a note in the biography with my name and date followed by a colon and then information provided.
Feel free to change his name, however, please remember that just because it is published as Aaron Brooks in one book, does not mean that that one book is the only correct source out there, or even that it is correct at all. We cannot assume just because something is published, that it is correct.
Have you found any original records with the name of Aaron on them? A Will? Estate file? Deed?
Ginger