G
Yeah they might sent him to protect Vegapunk. So him, Sentomaru, the Seraphim, the Punks, maybe that would be a way to include Weevil in the story too in some way.
I'm hoping for an Admiral to be associated with Sword too and given the sheer amount of mystery with him too, maybe it could be Kizaru too and thus further justification for him appearing?
But aside from that, sending him to protect Vegapunk or even him purposely stepping up and volunteering to do it would be perfect. Maybe this is why Akainu didnt want him to go to Wano too but he couldn't say why outright too?
Weird fun fact btw, I keep trying to pause and unpause the music I'm listening to using shortcuts on my keyboard and when I do, I keep hearing Blackbeards laugh! I'm freaked out now hahahaha or even zehahaha!