Board Thread:Questions and Answers/@comment-10797017-20130622101437/@comment-11051098-20130709130134

I think recognizing Isshin, and recognizing a Zanpakutô technique he has which he may not have had a reason to use while being a captain, is 2 widely different things. It's something I think cannot be compared.

As for captains and lieutenants recognizing him, I don't know. We haven't actually seen any proof that anyone recognized his reiatsu, even though they should have. Especially Rangiku and Hitsugaya who were lieutenant and 3rd seat in Squad 10 when he was captain, they should definitely recognize it even though it was 20-21 years at the time since they last saw him.

I personally think that if anyone recognized Isshin in Ichigo, as being related, especially Rangiku/Hitsugaya, they would have rather expressed it than kept shut about it.

About Kukaku/Ukitake, do you mean a meeting? The only such I know about is his visit when he told her about what happened the night Kaien died.