That’s a lot of head canon… All I know is, Zoro heard Hiyori… So either Zoro doesn’t care about her being there or Zoro already forgot that he heard her… if neither of these things happened, the logical conclusion from having Zoro hear her is Zoro going there to investigate
it’s 1+1 my guy… whether you believe Hiyori and Denjiro will one shot Orochi, Zoro doesn’t know that so Zoro is still going there to investigate