Tbh I think their actual fight isn't starting till volume 102 lol. Oda does this setup stuff frequently.
Refer to chapter 1005, where Robin started her fight with Black Maria, yet we never saw it for 15 chapters lol. There are plenty of other villains that still need to be taken out. Namely Hawkins, Apoo (if both aren't switching sides), Peros, Fukurokuju, and Jack. You could even potentially throw the numbers in there too.
I just think Oda will save these 2 for the absolute last moments where Sanji, Zoro, Law/Kid, and Luffy have their final fights against their opponents in a specific order. Before then we still have more ground to cover
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I wouldn't even give him the attention