Now the idea of OT and Oritolon joining up to fight Lukon. That idea set sail a long long time ago. While Lukon has upheld its oath to Oritolon for 9 years now...the two realms have drifted far apart. Lukon and Oritolon nobles do not have the spark of friendship they once did....and it is only held together by the "old guard"....who are few and far between. So I could see the chance for a fight there although Lukon would still have the moral high ground at least in my opinion 
At the same time, OT and Lukon have drifted closer together. It was Lukon who defended OT when they were down to one region... and then we helped them to defeat Giblot to end that blood feud that has raged from the start of colonies. Perhaps they would ignore that...or perhaps they look forward to the Empire so that they can have all different sorts of BBQ again...
Various bits snipped from above... So, the Outer Tilog view (well, the ruler's view, not necessarily that of everyone...) of what's happened (based on information that is not hidden).
Back when Lukon was Outer Tilog's sworn enemy, we warned the other realms that if something were not done soon it would be too late to stop Lukon in the long run - for a lot of the time we were ignored as a realm that was being beaten in war and giving out desperate messages to somehow try to save ourselves. Eventually that war did finish and we were not destroyed.
A few years later, when we were in a strong position, we called on all the realms (apart from Oritolon) to join together to free Portion from Lukon and ensure that all realms were once more at just one city (yes, it was that long ago). A lot of planning went into that, and it had every chance of succeeding. Unfortunately, at the last moment we were betrayed by one of those realms and it nearly cost us our existence. The Outer Tilog ruler then eventually said a few things which are not public, and since then relations with Lukon just continuously improved.
Since then they assisted us in rebuilding our realm and have been a very good ally that we have no reason to turn against. Also, there is still that memory of the last time we trusted our allies to try to do something massive and were severely let down. There is no IC reason that we would want to go to war with Lukon, especially given conversations that have happened over the past couple of years.
So though everyone combining to fight Lukon might be good, it's not something that Outer Tilog could really do and stay true to its characters. (well, most of them...)
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