I see. Can't wait to buy this! I'm glad the translation makes it all so clear now.
So, I picked up volume 13 and looked at episode 125. At the end of this episode, Musashi's walking, reflecting about what he's been doing, thinking about Otsu... and then crows show up, he gets a weird, eerie feeling, looks behind his back and even has to sit down after feeling this. Maybe Inoue hinted at Baiken's death back then and we didn't even notice. Of course, it's possible that he felt this way because of the fight, the new stuff he started to think after hearing Baiken's words and seeing him begging to be saved, but now it seems more like it's because of Baiken's death, especially because of the crows.