Ding Wenze had to mention Xiao Shupeng just to prove that Xiao Shugang, as a brother, wasn't doing well, making all the younger brothers dislike him. Now that he's in a car accident and about to die, he has it coming.
When he was a child, Ding Wenze suffered more than once at the hands of Xiao Shugang. It was always about him making mistakes, getting into trouble, and then having Xiao Shugang report him at home. In Ding Wenze's mind, a brother who tattles is definitely not a good brother. A good brother is supposed to cover for his younger siblings and help them clean up their messes. Sharing adversity and prosperity, that's what makes good brothers. Xiao Shugang, who stabs his siblings in the back, is just looking out for himself, trying to score points in front of the elders.
Xiao Shugang was indeed a righteous person, which is why he was highly regarded and frequently promoted by his leaders.
