It's a one-shot anyway. It's not like it will be a serialization. Who cares which character gets it
Cause alot of more interesting characters could of got more spotlight
It wasnt supposed to be any special manga anyways, just 1 or 2 short chapters, if we go by your logic then nobody is intersting beside white fang.
White fang is kakashi's dad
So he would likely have a story surrounding his relationship with his son which is okay ig but it's nothing that grand
I guess you could explore how white fang killed sasori's parents but considering how minor that was
kishi likely forgot that detail
three extremely minor characters fought at some unknown point