I still own the rights to v0.01 through v0.03, and the character/personality combinations, however I gave HeartlessNobody permission to develop the game from v0.04 until the end of the game, as long as he does not quit the team, and as long as I'm given credit as the creator.
So me stepping back in to take over development of the game would be in conflict with the agreement that I made with HeartlessNobody. So to answer your question, No. As long as he sticks to those two conditions, he has the legal right to develop the Lexi game from v0.04 onward.
I do however, still have the right to use those character/personalities in any future game I develop. That way Lexi and Kaylee will always make at least some kind of appearance in anything I do. And I can assure you that if they make an appearance, we're gonna have some kind of fun with them.
As mentioned before, when I'm awake, and have the energy to actually do something, I'm making characters, textures, and getting assets picked out and ready for after I get my health sorted out.