WB is a fruit user. Gura Gura no mi. An earthquakeman. Sengoku says he has the power to destroy the world itself

Creates a huge tsunami, takes out 50 thousand marines

Cover Story: Chopper barely escapes being cooked.

Title: "Ace and Whitebeard"

It turns out that Luffy already knew they weren't blood brothers. He tells the others that Ace's father was really Roger, which plays out similarly to when Garp told of Luffy's lineage.

Scene changes to Ace.

Ace's reminisces:
Setting out* ... thanking Shanks for saving Luffy ... discussing joining the Shichibukai **
Provoking Whitebeard ... dueling with Jimbei for 5 days ... and then the duel with Whitebeard.
The days on Whitebeard's ship when Ace plotted to kill him ... and the day he recognised Whitebeard as his father.

Ace: Despite Whitebeard specifically saying not to chase Blackbeard, I went after him without a care for my life. Its fine if you abandoned me here.

Whitebeard: What? Did I say that? I did order you to chase Blackbeard....

Whitebeard and his sons (the 14 division captains) discuss.

Division Captains: Father said to let you go. It's not your fault.

Whitebeard raises a huge tidal wave that splits the skies.
Sengoku: Whitebeard is the Quake Quake devil fruit user, a Quakeman. Do not assume we have the upper hand with more numbers ... he could destroy the world!

The tidal waves converge from 2 different directions.

Even though 1 side was stopped by Ao Kiji, the Marines would have instantly lost 50,000 men if Akainu did not block the other.

End

*: Ambiguous. Could refer to leaving Luffy's village, or chasing Blackbeard. Unimportant either way.
**: Most likely refers to Blackbeard's plans of becoming a Shichibukai.