I'm making speculations not assumptions.
I'm speculating based on King being the one to get control of Ringo, and King being the one to fight Zoro as we speak and as we are getting all of this Zoro/ Shimotsui Ushimaru lore, that Oda could be dropping all of this right after Zoro vs King has started, and right before we get into the actual chapters focusing solely on that fight, to expand the lore around that fight.
We've also seen King's unconventional sword and how he managed to disarm Zoro, and Zoro managed to defend himself with the sword in his mouth, which looking at Ushimaru this chapter, it's something he would not have to fall back on, since he is only using two swords.
Why would anyone even be opposed to this ?