Board Thread:General Discussion/@comment-4957813-20130929234239/@comment-8986886-20150416183625

Bige1218 wrote: Hitsugaya did say that Karin has a high level of Reiatsu, which explains why she is able to see the Shinigami captain.

Well, all of Ichigo's friends were able to see Shunsui clearly, when he came to the world of the living to explain what had happened to Ichigo. That level of Reiatsu is hardly comparable to that of a Shinigami.