Ren was someone who stood by his side for over a decade, Ren was the person he would have valued the most in his life as the chairman of Yugen holdings without the betrayal.
To ask someone as significant as Aiichiro to kill Ren felt like an insult because if anyone should do it, it should be him. The only person on the face of the earth worthy of ending Ren's life was him.
He was the one who got betrayed, so he should be the one to end their ill-fated relationship that was why it took him more than a couple of weeks to accept such a plan.
It was a plan he came up with after hours of unending planning and thinking but he knew he could stab Ren to death, soak his hands with the man's warm blood but that would be against him in the family.
