I think Tan Jiu has the talent for large narratives but seems unfocused and impatient. She jumps around and backs up to fill out backstory like someone who has a good eye for how to structure a narrative, but lacks the patience to finish out plans and execute them.
No offense, but that sounds like my point.
Someone who could do A but finds themselves distracted into focusing on B would seem to be strong in B rather than in A.
I intended it to expand on your point. You said she was better at character scenes than managing a large narrative, I was pointing out that I think the skill and instinct for a narrative is there, but lacking the focus to piece things together in order.
Edit: There’s also the Other Gay Guy, the not big one.
Upperclassman is the only gay guy, though. I'm assuming you mean Sun Jing's and Mophead's friend, who Upperclassman likes, but nothing Tan Jiu has shown us so far indicates that he reciprocates UC's feelings. In fact, most of his reactions so far are of crippling discomfort and panic.
In other words, if he's gay, he's at least closeted, in denial, and maybe even self-hating. Is it possible that the story is about him becoming comfortable with himself and dating UC? Maybe, but there's no real indications of it.
Or is that the wrong person, and I'm forgetting someone else?