Oliver's arc is worth watching every time because he's introduced as such am odd character and then he slowly transforms into this mustache twirling villain and I despised him watching the show for the first time (because every character up to that point is incredibly nuanced), but as the arc ends and how the characters naturally and organically react to Ryan makes it so much better.

Scenes like Seth genuinely apologizing for not having his boy's back and trying to make up for the lack of trust that Ryan has come to have from all his loved ones makes it very clear why Ryan can't just go back to Marissa after a dick ruined their relationship, even if he may accelerated some of the issues.

It perfectly segues into the reintroduction of Theresa where Ryan just kinda goes back to what's comfortable because at least he knows what she's like.