I don't understand what you want to prove, but Dik is no worse than Chick. Pink himself said that with the help of Dik, he wants to convey the atmosphere of student parties, fun and what it means to be young.
A massive dik is not an asshole and a jerk like you say. This is a party animal who obviously won't be liked by shy girls like Karen or Sally and vice versa will be liked by girls from HOTs. And Chick is an ordinary guy who likes romance and relationships. It was a conscious choice of DPC so that the player could play as he wants.
I don't think Jade's fuck will close the Sage branch. There will be a little drama, but in the end, the player's loyalty to the chosen girl on the path of the relationship will be decisive for her path.
Each path has its drawbacks. Chick is an incredibly hypocritical character. The game allows you to fuck literally all the girls and at the end of episode 8 MC hates himself for it, while Dik is rejected by almost all the girls except Sage. That is, for Dik, the choice in episode 8 consists of Sage and Others. The main disadvantage of Dik's way is that almost all girls reject the player and there is no romance on this path, but only fun and sex.
The player chooses what he wants.