Board Thread:Questions and Answers/@comment-31952030-20190204184155/@comment-29325824-20190204193744

Because 1) Ichigo has improved since his first fight with Renji. 1.5) Ichigo's power is noted to be in constant flux because he hasn't learned proper control. 2) Ikkaku was afraid to show his full power for reasons that will be revealed later. 3) Renji also got stronger since last time.