Your assessment of Jacob is inaccurate. Your issue with him is because he's "too normal". He chose to go to the HOT party with MC because the alternative was shoving a vodka soaked tampon in his ass. John Boy also goes eventually. He didn't do much because the Alphas were there & that's a potential problem. He was able to get his own girl at the Dorm party.
And people say it's "creepy" that he listened to MC & Sage. How so? What was he supposed to do? Leave Derek because the MC is having sex? Put ear plugs in his ears that he didn't know he would need because he didn't know he was going to have to babysit Derek at the same time the MC was sleeping with Sage? He had an excuse to outside. It'd be creepy if he was outside listening for no reason. Considering Derek was able to cause a girl to be loud in a tent means it's not that difficult to do in the BaD universe.
People either don't like him for whatever reason. Maybe it's racial (unheard of). Maybe people are upset because he took his shot with Zoey. Or they want to implicate him because he is the least suspicious person. His room was damaged the most aside from the library which was a 2nd bathroom before MC moved in. Why would he willingly allow the destruction of artwork of his that would take a significant amount of time to create? Nick's room was damn near untouched & both of their rooms are next to each other.
Like I said Jacob is a blank slate. Tabula rasa. Nothing is known about him and you can't say for sure which side he's on.
He doesn't have his own arch, even though he's been in the fraternity for a long time, it feels like he's keeping to himself, just like Nick.
It's just that if you pay attention to the other characters they are always revealed in quite a lot of detail and you can say a lot about each of them. Jamie and Leon's line is one of the best in the game.
Only in ep10 did Jacob have his own line related to Zoey and that was quickly shut down.
I don't know if it's a flaw on the part of DPC who doesn't reveal him in any way or if it's just done intentionally to tell anything about him, especially if it turns out he's involved in all the trouble with the DIKs.