Jade Sy

ADDITIONAL SPOILER
In this chapter, Usopp asks Brook why he suddenly went to fight Gunko, and that's when Brook begins to remember his life.
We don't know who Dozan is in the chapter, but it's written in katakana (F), and I think it can be read as "Douzan" or as "Dozan."
In this chapter, we see Brook's face without glasses (we see his eyes for the first time in the series). Also, Brook didn't have his scar on his head yet in this chapter.

What if Dozan was the previous Nidhogg DF user who fought Joyboy, but later lost his life in a battle against Imu?