Didn't Onimaru collect all the swords from the fallen Samurai in preparation for the War?
Ushimaru isn't wielding Nidai Kitetsu in this chapter, but it is possible he left the Sword with Hitetsu knowing he was going to die, so it can be passed down to another, or Onimaru brought it to Hitetsu, as he should know Hitetsu is the one who forged it.
Ushimaru isn't wielding Nidai Kitetsu in this chapter, but it is possible he left the Sword with Hitetsu knowing he was going to die, so it can be passed down to another, or Onimaru brought it to Hitetsu, as he should know Hitetsu is the one who forged it.
There is posibility it could have been confiscated by the beast pirates and Hitetsu got it back, i personally think there is good chance Nidai used to belong to him. Tenguyama reactions when luffy took it leads me to believe it used to belong to someone very important and in the previous chapter Ushimaru was referred as dai kengo great swordsman the only ones who have been called that in the manga is Mihawk Ryuma and Ushimaru recently