User blog comment:Nobody700/Chapter 753: The greatest flashback that never happened/@comment-99.243.47.188-20140716022154/@comment-2226235-20140716030139

A lot of the breaks have been due to Oda's health since he can't write new chapters if he's sick or recovering from surgery (which was the cause of the three week break a little while ago). As for the rest, Oda will get to it soon enough. He's never skipped a major fight involving one of the Straw Hats so I'm sure Zoro vs. Pica will be shown in a few chapters.