Gu Mo's thoughts raced as he quickly pieced together the clues he perceived, roughly deducing the entire sequence of events...
If it really was as he imagined, it would indeed be quite dramatic.
Logically speaking, if it weren't for the issues Kaguya caused in the modern world, it would probably be around this time that Inuyasha initially mastered the basic secrets of the Iron Shattering Fang, reading the trajectory of the Wind Injury. Then, Sesshomaru would have faced a setback, but the Tenseiga's protective barrier saved his life.
Incidentally, it was this event that led Sesshomaru, during his recovery, to encounter a human girl, which truly transformed his character.
The Iron Shattering Fang for protecting people, the Tenseiga for saving lives... The two demon blades crafted by the Great Dog General from his fangs were meant for protection and salvation. However, Sesshomaru failed to understand his father's true intent, merely pursuing power to prove himself.
