So - bottom line - the Twist did not change the story. Sophia's decision: accept/refuse blackmail determines what happens to Dylan.
I even provided an idea on how this could have played out but L&P simply chose to remove the Twist.
I don't know if this is the message that convinced L&P to get rid of that twist, but it may have been.
In a little back and forth with L&P I wrote him the following message shortly after the Dylan Twist;
Thanks, and very true I do believe he to some degree his motives may be simply to alleviate Sophia's midlife crisis, and if that were his predominant motive then perhaps psychopath would indeed be a bit harsh of an analysis. Can you however honestly say with a straight face that was his only motive, or his overwhelming primary motive? Looking at things on the other hand one must not forget that the boy has been a bit of a "peeper" spying on her in the shower / getting dressed. He has spanked the monkey to her as well, and it is clear he has been having numerous sexual fantasies about her. So, his own sexual desires could also be included as a perceived motive for his actions.
I have played through your game a number of times analyzing what you have made quite a bit, on top of me being a writer myself that often can predict the next plot point in many stories, but this was still able to surprise me catching me off guard which simply goes as a credit to your writing abilities.
So, his level of psychopathy I would judge based on "Which of his motives does the reader perceive do be strongest?
"I am horny for Sophia" vs "I want to help Sophia out of her midlife crisis". The story has included as it must include a lot more of the "I am horny for Sophia" (Beach changing room scene, begging to see boobs at the store, bikini fashion show to name a few) coming from him much more often than "I want to help with midlife crisis" elements in my opinion. It feels like that scale is heavily weighted to one side.
One must not forget either;
It didn't appear to be a "genuine apology from the heart", more so a "forced apology". Remember, Zac had to punch him in the arm and guilt him into the apology in the first place. So part of his reason for apologizing in the first place is social pressure from one of his best friends, not genuine remorse for his wrongdoings.
Next, one must consider the fact, he mentions "Fight Club" in his reasoning. He got himself beat up on top of beating himself up in the aims of his objectives. One could say he views Tyler Durden as a role model or a person who he would like to be like. Tyler Durden is very clearly a psychopath, perhaps with some mental illnesses in spite of him being a very intelligent, popular, and relatable character.
In the subtext of the game, it can also be seen that Dylan idolized Grand Theft Auto 5 as well as he cares about it enough to put a poster on his wall. The player characters in all the GTA games could be described as psychopaths.
Also on his wall is a "batman" poster. One must not forget the 2012 batman shooting on Colorado. Perhaps he idolizes the Joker character who could be viewed as a psychopath role model as like Tyler Durden. One could argue he looks at himself as batman as well a vigilante.
Then imagine putting Dylan side by side with Sam. Compare and contrast the two as to who has more "pure motives". It's clear Sam can be looked at as the more pure of heart between the two.