What do showrunners do with a genius like Tony Shalhoub? In Season 1, you ask him to play a version of Monk. He’s on-spectrum, brilliant at math, and able to connect with almost no one. He likes his library, playing piano, and being left alone. All of his students are idiots in his opinion. He’s a strange side character, probably an ivory tower Six.
In Season 2, when Rose has her mid-life crisis in Paris, Abe shows amazing sensitivity. When he finally realizes she’s gone (lol) he follows her and lives with her, jumping into French life. His practical self from Season 1 is still there, though. He makes it clear when Rose wants to take an apartment that their life is not here. He’s firm, persuasive, and calm, and Rose returns with him. He’s left the ivory tower and taken a more main character position. He could still be a Six. His coffee time with the French philosophers is very Head Type. When they get back to New York, he schedules dance lessons for them so they’ll be better than they were on the banks of the Seine. He brings Rose into Columbia to study. It’s an intellectual world, still distant to him.
It’s Season 3 that begins Abe’s transformation to a different Enneagram number. (Needless to say, I’m horrified.) He’s no longer a Head Type, but a Heart. He’s quit Columbia, he’s lost his apartment, and he’s surrounded himself with young, restless people. He’s no longer romantic towards Rose, but wrapped up in a rebellious, beatnik lifestyle that is a mid-life crisis on steroids. He doesn’t collect things (not a Two), and he’s not successful (not a Three), which would make him a poorly-written Four.
As you can already tell, I’m labeling him a Null. You don’t change numbers. You don’t upend character. Even if you’ve cast Shalhoub, you don’t ask your actor to make sense of an arc that twirls about and goes nowhere. Everything I loved about him is gone. It’s heartbreaking.