GW3 was the funnest, in my book. It remains the biggest war in CN history, and it took place before the WRC and the tech bonus. Good times.
SG was long gone by that point. It had died almost immediately after PB-NpO, about 1.5 years earlier.
Not accurate either. That war was largely the work of the Citadel alliances (namely Gre, TOP, and Umbrella) and some Q allies, an effort aided by the fact that electron sponge had managed to piss off just about everyone in CN. The NPO was not involved in making that war happen; quite the opposite, really. Indeed, NPO was the reason it did not happen earlier, as they spent months deliberately standing in the way of those who wanted to attack Polar. They stepped out of the way only when it became clear that they risked severely alienating their Q allies otherwise. They blew a ton of political capital on protecting NpO, which turned out to be a terrible decision; they offended many of their allies, and this led quite a few of those to break with NPO in the months after the war.
For the record, I still think that WotC was the most well-executed curbstomp ever. And I don't think any war has topped its blitz: over two thousand wars declared in 20 minutes. A silly game though this may be, I still take a bit of pride at having been at the head of that war effort.