What if they are humans from the future?
I've always thought this was pretty obviously the case
Encounter at farpoint has a number of things that hint at this idea.....If the Q know that humans are very powerful in the future (and we accept they can travel in time) then why travel back to ask these questions of humans....why not just ask the powerful humans of the future
Unless.....the Q are the humans of the future and are interested to know how they became Q....what is it about their ancestors that led to this
well, why not just go back and ask/interact with your ancestors