It is the best position,He is pretty much useless in the centre,and Even if he went to the Right wing,YTW isn't falling in one day, ,Unlike The left wing where he had much bettter chances to quickly defeat Ousen's vassals so he can flank Qin's Central Army.
YTW's armies were pushing in pretty early, I trust in RBK's ability to take advantage of that. I trust in his ability to beat YTW with a numerical advantage.
Ri Boku consolidating with En Kan on the Zhao Left Wing would've been a
good option, I hesitate to call it the
best option because a) his deputies and stronger armies were on Zhao Right Wing, and b) I trust Ou Sen and his vassals to be able to tighten up defensively.
If he were to move the 40K reserve to the Zhao Left Wing, Ou Sen would still be in position to make moves of his own. He could draw back Sou'Ou and DRM to consolidate closer on his flank, and/or dispatch the HSU in part or whole to help facilitate that move. There would be plenty for Ou Sen to do upon the sight of RBK moving that many troops.
He isn't pushing on all three fronts,All Zhao right wing was doing is to try to stall ytw.
Moving against ytw would change a thing,She isn't falling easily,The best thing thing Ri Boku can do is too cooperate with Enkan so they defeat Ousen's vassals.
The Zhao Right Wing couldn't have defeated YTW but I certainly believe they were supposed to try, and with RBK, Fu Tei another 40K they absolutely could have. I have no doubt of that tbh.
Zhao still outnumbered them by a lot(Even without counting Ri Boku's reserve Army of 40 000,Zhao still outnumber them by 10 000)+and Ri Boku's presence will boost the morals to an insane level and his tactics should be more than enough to defeat any Vassal of ousen(Remember what happened when Ri Boku moved up against Akou in Shukai and how easily he deciphered his defensive tactic).
I don't see a world where Qin's right wing is surviving.
I don't think Ou Sen would just allow anything to happen there. imo, if he's putting Sou'Ou on the Qin Right Wing and DRM in the reserve, he can probably count on them to fall back to a point he can reset.
There is good terrain for Ou Sen to take advantage of defensively, wouldn't you agree? I'm not talking about forts, so much as taking advantage of the hills, forests and mountains.
I didn't assume that Ousen will send Shin or kyoukai,Bear in mind that all of this happening while Qin's right wing is at the verge of collapse,I assumed that OuSen will want to keep a strong fighter close so he don't get flanked.
I definitely disagree you should take it for granted the Qin Right Wing will collapse.
Again, Ou Sen has many options to deal with that and the terrain is quite favourable to him recalling both Sou'Ou and DRM to form up closeby defensively, to which he could add troops from his own 30K while he conducts the defense - I believe Ou Sen could do that and deal with SBS in front of him at the same time.