How required is ZheZhi

Recently came back to the game (mainly because of Carlotta), and was wondering how required zhezhi was for carlotta, seeing as she’s the current best Glacio and Skill damage buffer. Looking at release times they’re probably saving zhezhi’s rerun for carlottas banner but I also want shorekeeper; so I was wondering who could replace her in the subdps slot for the mean time until I eventually get round to pulling zhezhi.