If post Queen Sanji has to chase after Robin in a repeat of the W7 Sea Train CP sequence, but this time he actually manages to get her back from CP0
I think Brook and Sanji would get quite the spotlight on this event for a few reasons:
1- Sanji brought a lot of atention to Robin. Even if the Marys were a thing and that black maria shenanigan wasn't necessary for the CP0 to be aware of Robin's location, Sanji might feel guilty. And just like he once relied on her, it would be nice a little reciprocity of Robin relying on Sanji / Brook is the one accompanying Robin right now, so he also might feel extra guilty if she's taken on his watch.
2- Brook didn't participate in water7/EL, so it might be important to give him his shine moment on protecting Robin from the WG.
Luffy will get the common "get completely rekt after the main fight", and Zoro will have the backlash from the medicine. It's likely these two will be out of comission, giving more room for the rest of the SH's to take the CP0, adding also Yamato on the mix.
Can be quite an interesting event.