Board Thread:Questions and Answers/@comment-2023646-20190610085628/@comment-5171765-20190610093210

Yhwach Loyd/Royd, which ever of them it was, said as much - they didnt recognise it at first. Yamamoto said all the power of the East attack was concentrated in to the tip of the blade, perhaps before he mastered it the power was not concentrated and so more noticeable

Its not hte only one to change over time - Renji, Toshiro and even Byakuya after being saved by the Zero Squad