Doesn't this prove that Riboku is kinda not needed. Zhao could hold its own against Qin without him.
As for Wei thinking of accepting this idea. That's dumb. No matter how you look at it, this deal is not good for Wei
Qin basically made Wei, Chu's enemy, using Chu's own territory as bargaining chip
Zhao has numbers and defensive advantages on their side, not counting shortened supply lines. Zhao also effectively only have one battle front instead of Qin. This is good, but it's probably not enough to win and reconquista without Riboku, as their strategy is dependent on Qin making mistakes, or occupied elsewhere.
Zhao did score some victories as we'll see soon, without and with Riboku in command, but of course it wasn't enough.
That would be impossible. As Karyo stated, the line with all the forces how they are is stagnated, then taking away forces to attack Wei would be enough for Zhao to break through defense and regain the lost territories. This would also mean losses on Qin side which would make them loose even more manpower they already struggle with.
@OverReaper
I would rather say there is a stalemate, because Qin is trying to push through. If they went on a defensive instead I imagine they could afford to pull out some units.