Even if all that is true... who knows when Hibari will show up, a free black on Nutaku is a sketchy idea given their track record, Momoji isn't like the other samurai anyways, Kojuro min-costed is a sketchy idea since Nutaku's pace says without whaling you aren't going to get that for about 3 years if that...
As far as Nutaku goes AT PRESENT, not looking at the future of only god knows when, Shizuka totally outclasses Kojuro outside of cost in 95% of situations. Kojuro might have solid status on DMM, but this thread is about Nutaku, where he's an off-tank rush blocker just like Shizuka, with superior HP and during skill, Defense (though she's self-healing to make up for this).
Side Question: what's lr stand for?