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Marco Will Take over.
left page, top right panel.
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Marco and the surviving whitebeard pirates post war.
they are still referred as one of the Yonkou.So yes Marco is the captain and his now one of the yonkou.
"As for entities capable of stopping his advance… I'd have to say the four emperors or perhaps Marco the Phoenix and the remains of the Whitebeard pirates."
You could even make a case for a mystery Yonkou, since it separates the Yonkou and Marco.
Also, just for shits&giggles. You'll notice beardy 5 star on the left talking about waiting for the New World to settle down before they elect a new influential person. Seems strange that glasses 5 star says they need 3 shichibukai. Why just one? Are they trying to hand pick their own Yonkou pawn? Should be posted in the Theories thread, so I apologize.