IRON has a lot of nation over 100k and not near the top 250 that could have hit lower end DBDC nations, Polar doesn't have has many of those and not enough with the tech numbers to make a difference.
Either way I doubt many of people that want the day "saved" would have wanted to fight with IRON so it's a mute point, unless you wanted a single alliance to do it without any help.
The last war seemed like a good time to fight DBDC, do you agree?