Not sure Stephen is a wimp, i think he just checked out a long time before the story even started lol, he seems soooo over it from the very beginning
Imo sage with the wrong boyfriend like maybe chad but not gay could very much turn out exactly like jade 100%, building more and more silent resentment and regularly exploding. Its kinda what happened with chad in a "light" version already
Her "luck" on her route is that tremolo is like the 100% opposite to her, when she wants to build her walls up, he annoys her until the problems get drawn out and therefore a solution created. Hes kinda too endearing for her anger issues

and softens her up more and more until shes completly vulnerable
Thinking about it, i think Burke being a wimp would have been a better outcome for the marriage with jade than whatever fucked up kind of relationship they had