>>715568596
The Ichiban part of the ending taints him as a character. There's no reason for him to be so forgiving to fake wheelchair boy. It's a total flanderization of him trying to get his step-brother to get on the path toward redemption from the last game.
Similarly, Kiryu's confrontation with his final boss isn't built up at all, and ends up completely mogged by the Shishido fight from Gaiden.