Zoro vs Sommers almost guaranteed to conclude first. Oda has focused on Zoro discovering Sommers weakness for 2 chapters now.
We see Sanji vs Killingham panel happening at the same time this chapter and Sanji hasn't even unlocked his CoC yet.
So having Sanji unlock CoC, unlock aCoC, master aCoC, and then figure out the heart weakness all before Zoro could put down Sommers, while hilarious, would be bad writing.
Sanji's fight hasn't even really started yet as Killinghams not using Zaza or his summons.