I chose Krile's path because I don't want to lose allies when there's even the slightest possibility that it's not necessary. During that path, Eureka is sealed as Krile suggested, although Ejika insists that we're just delaying the inevitable. The isle is left under Ejika's supervision and Krile returns to the Scions.

After choosing this route, I found out that there's another cutscene if you complete the Baldesian Arsenal. I know what it is (roughly) if you chose Ejika's path, but I'm very curious to find out what happens if you chose Krile's. Hopefully more info about that will be spread online eventually, because I don't plan to do BA. I wish SE hadn't locked story behind it, honestly...