Marines desperate for a W
They need to wipe out that island from the face of the earth
You're probably right. The ability to take out Dragon, and his commanders? The Marines/WG don't even need this for political purposes, they're straight up getting their asses kicked out there.
If the Marines think they can actually wiped out the Revolutionary Army all at once, they'll consolidate their forces into that.
I hope you're right. Imagine Dragon finishes talking with Sabo, and then looks down in confusion as cracks appear in the ground. Suddenly, lava starts shooting up into the air, and everyone begins screaming and running away.
Akainu grabs Dragon's leg while climbing out of the earth: "So. This is where you were, you criminal scum. Revolution? No. You're just a worthless rebellion that will be erased today, along with this island, just like the Void Century, and Ohara. Melt into a statue of ash, Monkey D. Dragon."