It's his way of handling things. Also HSUs awakening was under Ousen's calculations.
Pointing subordinates in the general direction of enemies and saying "go deal with them" is also Mougou's way of handling things. That doesn't make him a better General than Renpa. Lol.
In Shukai plains, both were targeting the enemy general of one wing on day one. Ousen's wave attack was more impressive and Riboku's way handling bigger task to remove enemy commander of the wing himself was also quite impressive. Riboku was successful there. But stalemate later on.
In the right wing, again Qin was the first one to lose a general and GakuEi around at the same time for zhao but Ousen calculated HSUs awakening and later Riboku lost both CGR and Gyou'un.
In the central battlefield, Riboku outright got demolished with Ousen's was of doing things. It was at this moment both came face to face and Riboku there had no counter for Ousen's movements. Even when Riboku got his Pokémon back there, situation didn't look good for him.
I) Ousen didn't accurately predict the HSU Awakening since it was actually Ouhon that pointed Shin in the direction of Awakening his unit while Ousen didn't put any stocks on Ouhon awakening his own unit, let alone pointing Shin in the direction of it. Lol.
II) The whole stuff about the center is moot when it was entirely reliant on the Qin Right Wing achieving their objectives, which they achieved without any assistance from Ousen.
III) Wasn't it after their face to face meeting that Riboku pincered Ousen's HQ between Bananji and Futei with Ousen not dying due to getting rescued by Mouten and Ouhon, both of whom acted on their own initiative? Lol.
IV) Again, the loss of Makou and Akou are attributable to Riboku since Riboku personally killed the former and devised the plan that temporarily removed the latter. The loss of Gaku Ei, Gyou'un and CGR isn't attributable to Ousen since Ousen literally contributed nothing to the demise of those three. If pointing subordinates at the opposing army and saying "go beat them" counts as a direct feat then Mougou has defeated the likes of Genpo, Rinko and Kaishibou. Lol.
So bro we can't just look at Ousen's comments on how they won but as a whole not only Ousen won the campaign but enemy generals/key figures accepted that it is Ousen who defeated Riboku.
Give me one good reason why I should listen to any of these supposed figures over motherfeckin Ousen himself? Lol. Cause the only notable named Zhao characters that survived that battle besides Riboku himself are Futei, Kaine, Bananji, Kisui, Batei and Earl Rai. Are you saying that any of these characters understand the tactics of Shukai Plains better than Ousen? Lol.