Just checked.. okay yeahhh Toby changed things along the development to Noelle and Kris NOT drowning but eventually going somewhere else? Heir hair stopped floating!
(the very LAST close-up isn't used but likely was meant to be for when dialogue box goes white)
Three was willing to permanently murder Six, in the same episode that it's made clear that One doesn't want to murder the Algebraliens.
If there was any "the real big bad is Three" foreshadowing, this would be it.