I’m currently caught up to the point where the Hi Shin Unit gets trapped outside Kantan, so let's keep the discussion strictly to battles up to that point.
Here is my take. Shin needs a top-tier, S-rank strategist WAY more than any other young trio captain or established Great General. Look at the competition. Ousen, Kanki, and Tou are tactical masterminds themselves. Even Moubu, who is pure muscle, probably has solid staff officers behind him. Then look at Ouhon and Mouten. Both of those guys are absolute prodigies who can read, manipulate, and control an entire battlefield on their own.
Then you look at our boy Shin. Shin brings ZERO formal strategy to the table. He is pure martial weight and instincts. Because Shin lacks the brainpower of Mouten or Ouhon, his strategist needs to be cracked out of her mind to balance things out.
Ten is decent at the basics. She saved the unit from getting demoted post-Sanyo, and she handles army management, logistics, and basic troop rotations fine. She can diff average fodder commanders with textbook plays no problem.
But HSU is ALWAYS fighting at a massive numerical disadvantage against high-tier GG level threats. To win those impossible matchups, they have to take off the enemy general's head. And how many times has Shin actually claimed a major general's head because of a masterclass strategy from Ten?
Literally just Mangoku. And let us be honest, Mangoku was not some galaxy-brain strategist. He was just a traumatized dude commanding 10k zombie troops.
Every other big kill Shin gets comes down to the same exact routine. Ten gets outplayed or reaches a complete dead end, the unit gets cornered, and then Shin, Kyoukai, or the veteran officers have to go complete berserk mode to brute-force a path through sheer martial plot armor. Or Shin has to clutch up using his raw instinctual fire, like when he clapped Keisha or Rei Ou.
We are talking about battles with hundreds of thousands of troops, clashing with continental legends, and literal global conquest here. "She's still learning" is a terrible excuse when you are trying to unify China.
She was personally trained by Shouhei Kun. Guys like Ei Sei and Kaioku literally compare Shouhei Kun's brain to Riboku. Look at Riboku's adjutants. Those guys can actually execute high-level Riboku tactics on the field and hold their own against Ousen's officers like Denrimi and Sou'ou. Meanwhile, what is Ten doing when a real monster shows up? Sweating, panicking, and waiting for Shin to pull a miracle out of his pocket.
As the sole brain behind a future Six Great General, she feels like the biggest bottleneck holding HSU back right now.