Well, we haven't everyone in the team for quite some while now.
First we were shown Kaze and Takeshi and now Katou.
It's not like Oku is only keeping just Nishi out of the picture.
So far, it's almost the entire team.
And about Nishi appearing near the end and killing a boss.
Just look at the boss in almost every mission. They are quite though.
And these guys seem to be on an higher level than the ones we saw till now.
I highly doubt that Nishi is even close to kill one of those.
His fighting style would never work on a boss. To hide and kill a boss if there is an opening is not impressive. That's why Oku wouldn't draw it.
And as far as we know that is the only thing Nishi can do.
"For Feanor was made the mightiest in all parts of body and mind, in valour, in endurance, in beauty, in understanding, in skill, in strength and subtlety alike, of all the Children of Illuvatar, and a bright flame was in him"
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