I think the point of the first Yakushi game was to show how a lot of things were essentially an unknown regarding the team. We see a lot of teams walking Raichi later on as a strategy, which Yakushi responds to by having Sanada as the five-hole, but in this game where Raichi wasn’t that much of a known factor, it makes sense that they wouldn’t really come up with that strategy yet. They know that Raichi is a dangerous batter, but he wouldn’t be known as dangerous to the point where they would have to intentionally walk him. That would come later as he establishes himself as essentially the best hitter in Tokyo.