This time is the exception that confirms the rule. They deserved this after all the accumulated merits over the years, they're basically being acknowledged as Qin's equivalent to Keisha (closest guys to Qin 6), which is fine because let's be honest, no other general in Qin is close to them.
If this was the route Hara wanted to go, I would’ve have preferred they would have immediately jumped from 10K to 50K for the recent war.