Sorry - but what is the problem again ?
Writer abondoned the game or something ?
About revenge path - I have a bad feeling about it. It sound cool on paper, but it very easly can be a route that neighter fans of ntr will like, and people hating ntr will not accept as well (since your girls are allready "tainted").
If you want to make more than 2 routes - my idea would be a bit diffrent.
Route 1
Alpha route - MC wins all girls and gets harem
Route 2
Realistic good route - MC has to deal with probability of loosing the girls if he does something wrong. He has to ultimately choose some relations over others. Some of the revange taking back NTRed girls can happen here.
Route 3
Standard NTR route (Beta) - player observes as other guys (mostly Marcus) take all the girls for themselves.
Route 4
Hard NTR route - player romances the girls and they are in love with him, but bad guys still manage to get to them through various means - blackmail, rape, coertion, taking advantage of their vulnerability. In short - girls dont want to betray MC, but they do, and eventualy love cheating on him. Most of the stuff happening without MC noticing it untill it is too late.
I kind of wished more of the Route 4 type of NTR happened here.