@Shani: AHH the manual. Dai ultimate weapon! I iz dead!!! I surrender!!!
While the manual does have Oku's seal of approval, it was published a long time after the Tanaka Arc. At the time, Oku might have considered a different marking scheme, but changed his mind when the time came for a manual. Of course, he couldn't change the wrong figures of the earlier chapters. This is the Oku Files, remember? We are more concerned with coverups and evil/obscure conspiracy theories that statement of facts
Off: I would like to take this opportunity to cheer for our spoiler bringer, Shani Andras. Hip Hip, Hurray!!!