Thank you for the Tag.
Results of the rounds (will give explanations later):
Round 1 - Ouki army takes the W around mid-diff due to the number of individuals being the same.
Round 2 - Ouki army takes the W solid high-diff
Setting some premises pre-explanation:
Strongest fighter in this is by a decent margin is Ouki. As strong as Kanmei is nothing states or portrays him being superior to Bayou arc Houken. Especially on Hara's end with Houken being at 100 & Kanmei being at 99. And unlike Ouki he doesn't have any "Great General of the Heavens" factor (no, not every general has a great general of the heavens factor) going on which gave Ouki a megaboost in overcoming that stats defecit with Houken. Bayou arc Houken was about to be beheaded by Ouki, who had no big injuries on him except a decent size cut at the waist. Heck the man practically low to mid-diff the Houken that killed Kyou.
Best strategist in this is also Ouki due to his mega experience. After that we have Tou & Karin at roughly equal status. So there's a big difference strategically between the two, since Kanmei and his cronies can't face up against Ouki tactically.
Round 1:
Ouki alone can handle Kanmei & Karin strategically. This leaves Tou to do extra damage (assuming he'd be commanding the forces and not just acting as an arrow like he did at Bayou). He'll first go and pick off Rinbukun fairly fast. Then the aim would be to go after Karin or eliminate Kanmei's underlings. But let's suppose Kanmei decides to join the fray and with that Ouki also decides to come in.. well then Kanmei just done fucked up. And.. Ouki coming in personally is the last thing Chu wants. Why? because when Ouki is leading the army himself, it's simply too OP:
The reason Coalition Chu army was tough for Qin wasn't because Karin or Kanmei posed a greater threat than Tou & Moubu. It was strictly the sheer outnumbering of the forces while having similar or better quality of soldiers, a total of 60k gap between the two armies. Karin had more tools in her hand to use than Tou did, that's about it. And of course story elements like the giant elephants that should've been seen long before they were used, but instead were stealthed to a point that they were only noticed when they were deep into the battlefield. That ain't the case here.
Man I can't stress enough how HUGE of a deal Ouki is. Hara had to nerf the man by giving him a ragtag army to use at Bayou arc, same with Renpa & his Wei army. These mfs were nerfed HARD, if they were leading their respective proper armies, those two battles would've been way too 1-sided. You need to bring freaking Kouen himself in order to match this man here. Anything short of Kouen is not getting it done for the Chu if Ouki is the one here. Or do some sort of a timeskip to the Chu arc and maybe that Karin would be standing at the same level as prime Qin 6 Ouki.
Round 2:
This is where it gets to a solid high-diff, due to the deadly sniping of Hakurei (which can pick off Ouki army commanders) & the other dude's combat skills. But it's not anything that 2-3 of Ouki's underlings wouldn't be able to handle. Just depends on how Ouki decides to deal with them and the type of tactics he'll use to make them ineffective. Very well could be little less than high-diff, but not going anything above that.
All in all, you can give equal numbers to the Qin duo in the Coalition arc or even just 130k vs 150k and they more than likely would've beaten the Chu Army. Putting Ouki in + GG Tou while giving Qin equal number of forces is just a 1-sided W.
Yoo man y'all don't realize how overpowered Ouki / Renpa / Hakuki are as generals in their primes. Even among the Wei Fire Dragons/Qin 6/ Zhao 3 these dudes are simply cream of the crop, whether we're talking historically or in-manga.
