@The_Vania_Nation:
Well, it's a very pointless war, considering that all attacks were not done in a coordinated and highly planned manner. Too many possibilities could have happened, most especially that the attacking side did not focus on one particular front, that the defenders were given enough time to recuperate and bolster their defenses. If the Core Powers concentrated on a specific campaign, then the Concordat would have been defeated one by one as a whole contingent of multi-national forces invaded Concordat space, one world or sector at a time. Sad to say, all of Vania's efforts, though done heroically on behalf of the Core Powers, all went in vain. And yeah, the peace talks happened sooner than expected, without opting for more time to think about and expand influence to make the war more widespread. Basically, it is more like a localized conflict instead of a full-fledged Galactic War, nothing worth the attention of getting dragged into.
If you are asking about additional outcome, all I can say is it there would be a great tip in the balance once other nations get involved, most especially us. There would be huge twist and turns. Sadly, it never happened. But we are always vigilantly watching.
@Drodinger:
1. Well, nothing special in particular. We've met multi-species nation like the Shoukouans, and we are kinda getting into it. (We have vassals called Blytherans, a particular species of interest we see as fit for continuing our legacy in the very far future) But it's good, as we value harmony, though we would place more emphasis on purity above all.
2. Well, it would be our ego. It gets us into places, mostly bar brawls and bitter conflicts, but definitely places. As a nation, it would be our space navy and air force, which is not given more emphasis, and mostly revolve around amphibious warfare and secure transport of our gargantuan-sized planetary assault army. In the far future I highly believe we can mitigate that, but right now, we are contented with our techno-symbiotic intelligence ship commanders and drones for our navy.
3. If you could handle mouth-burning spicy cookies, why not?