What if scenario: Zhao and Wei reinforcements arrive in time for the Eitei plains battle, which side takes it?

[KageyamaShoyo]

 

[BanditKanki]

Han win.
Yoko and Haku kill Shin because either Ryuuhan or Ranbihaku prevent him from being saved.

Futei either kills Kanou or at least prevents him from reaching Raku. Bananji decimates whoever he hits.

It’s a heavy loss for Qin.

 

[Xione]

Tou still wins, but there are larger causalities, the war will get dragged out over multiple days. Tou's present strategy was related to ending it as fast as he could before reinforcements could arrive. If reinforcements have already arrived, it's now a longer term war, similar to Bayou/Shukai/Sanyou.