Ivotas, I interpret that image as Valentine hopping off the side to avoid the Marines while the other Baroque Works members are causing destruction elsewhere, but I can see it from the other angle too.
@Buccaneer:
I know it's been mentioned, but just thinking about it: a barrel showing up at the Gate of Justice would be the coolest thing ever.
I'm still looking for the Justice Tower to fall over and make a bridge, though that might be how Luffy and Robin come back across.
Second, we have no clue how strong Doflamingo is. Except "very."
Actually, we don't even know that. An ability like his doesn't require the person to be strong to be dangerous, especially if it's effective against people like Aokiji.
@Kokolores:
You can't compare Franky with someone who destroyed a country in passing and send one of his crewmen to a meeting between Marines and Shichibukai.
The Blackbeard Pirate Crew's destruction of Drum was based as much on the fact that Wapol was simply unwilling to take risks by defending it as it was anything done by Teach and Friends. Other crews could have done it as well; Arlong carved out a sphere of influence that was much larger than Drum and received considerably more resistance by all appearances. The Franky Family probably could have done it as well.
Even now, we don't know why Teach attacked Drum, especially seeing as how it's contrary to his goal of working with the World Government. Wapol either provoked him into such action or there is something else entirely to the situation.