I think that it would work best for Warren if Nate took the darker side of himself out and gave it a physical form making it an entirely different character, leaving Warren truly himself and allowing him to move on, though with Betsy imho and then have neither need the other to stay normal or whatever or serve as a crutch for both, give them something new together and Warren would be fine as would Betsy, something new interesting and meaningful...have them co lead a team...