The worst representative compared to district lean won reelection. He's only in office because he won a crowded primary with 40% of the vote in 2018 and Hawaii really favors its incumbents.
Keohokalole ran (as far as I saw) a pretty bland campaign about "it's time to change" rather than focusing on Case blocking Biden's initial BBB or voting for the SAVE Act. No real defined policy in the ads I saw other than "things are more expensive". Ed Case leaned heavily on him being on the Appropriations committee though I can't remember him bringing back any meaningful money.
Hawaii's elections are pretty much decided in the primary and you only need to declare which primary you're voting in on the ballot. There were likely Republicans voting in the primary as the Republican primaries are basically inconsequential.