This can happen without act ending though, Oda already did it by showing Mary Geoise and Gorosei in the middle of the battle
That happened because the WG ships finally arrived to Wano so there was a direct connection there to go back to ths Gorosei with the Nika fruit too
But I guess Oda can do the same now, maybe with the WG ships alerting Mariejois this time that they are backing off or something like it
 
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