We have to see. Idk if Zoro will get solo fight given he just support to Luffy for Kaido and Big Mom situation. Feel like he be hype tool for Luffy as he continue coming back more and more.
Sanji seems more with King or Queen given hints on facing either one. Idk about Jack yet as still others who are free to face him as well.
As for now, Zoro won't have 1 on 1 fight just like Sanji.
You say Zoro is a hype tool for Luffy but you knew Oda using Sanji as a plot for Robin finally have a 1 on 1 fight.
Sanji won't fight Jack all along. They just gonna have brief clash also I think Red Scabbard possibly Neko Inu or Raizo gonna try to fight Jack (hyping Jack) more.
Neko Inu and Raizo probably want to killed Jack the same as Jack wanted to Killed them, also try to repay Sanji kindness for saving The Mink.
Actually I curious if Sanji able to push Calamities (Queen and Jack) to Hybrid form if that happen, Sanji final opponent is Queen/Jack.