User blog comment:Xilinoc/Ch. 577 - SWORD/@comment-4207271-20140416082233/@comment-5398287-20140417174935

I think that in this particular invasion, Yumichika will get the chance to use his Shikai again, if only because of how isolated a lot of the Shinigami are. I'm sure that if he were near other Shinigami and was somehow facing a Sternritter, he'd stick to using Fuji Kujaku because of his personality, but he's happy to use Ruri'iro Kujaku when he knows no one else will see it.