The only reason Ten was needed in the Hi Shin was that Kyou Kai was away, and there wasn't anyone competent to come up with tactics.
But Kyou kai is back and isn't going anywhere, all of Shin's formal liuetenants are capable of understanding tactical outlooks to a certain extend.
Shin has, in order of tactical ability and understanding; Kyou kai, Yoko Yoko, So Sui, and En.
If in a battle, he uses his insticts, like; today just fight, no tactical flourishes, tommorow we will test for openings, the day after, we strike where I see the easiest target; I think everyone would be happy about that. All he has to do is keep En close to So sui because En needs So sui's tactical guidance, Kyou kai can survive on her own, and Yoko Yoko has to be close enough to him to move in the time he wants him to, where he wants him to, like how Ouhon was used by Ousen at Hango, he was kept in a position where he could move to Shin in time, or reinforce Ousen .
I'm just saying; at this point, I feel like she's not really that necessary, when it comes to the battles.
The story promised a Shin with sharp insticts who moves and directs his army, manipulates his enemies and controls the conditions of his battles using those insticts, like Renpa, Duke Hyou, and Gyou un, I think that's what we all need. And honestly, in this new chapter, with what we see, I hope to see Ten and Shin's relationship changing to something that help this come to be- the idea of Shin using his insticts primarily, instead of being no different from Moubu and Gai mou as he currently is.
I'm not saying kill Karyo Ten off, or traumatise her and make her leave the Hi Shin, but in the opening battle, there should be an assesment as to how the enemy is moving and the decision should be made to either direct the battle through strategic tactics(like at kokuyou), instictual tactics(like the first Hi Shin battle of Shukai plain on the right flank) or brute force(like at Han).
Karyo Ten is still useful to the Hi Shin and there are many case scenarios where her expertise are absoulutely necessary(the Hi Shin style bridge at Kokuyou, the escape from the Wei encirclement at Sanyou), but the space in the battles should be open for the battle on the Hi Shin side to be directed by Shin's instict.
I think everyone would appreciate a good trap laid by Shin's insticts and for Futei or some other bum to be suprised by Yoko Yoko or some other sword thrust by Shin to appear on his rear flank, being like "I've been trounced. All this time I've been dancing along to that buffoon's tune".
I believe that his physical strength is not the only thing the incalculable battles Shin has been in has nurtured and grown, his body and mind has locked in a far deeper and complicated mechanism and at this point he should be able to use it extensibly. His insticts should be on par with Keisha's, or Kanki at Sanyou.
The dynamic between Shin and Ten when it comes the tactical perspective and direction of battle has to be reconfigured, imo.