Indirik is entirely right. The only reason why Odoaker would seek an alliance with Eponnly at this point is if it meant a larger realm could be broken down into several realms (or to stop a large realm from expanding even further at Eponnlyn's cost). But really, Eponnlyn is only considered a possible tool to use in order to break up larger realms before it itself is broken up in two pieces. Now, of course, you will not hear that explicitly said ingame. That would be very foolish. But perhaps now you can understand Perdan's new course better.
If my char gets his way Sirion might actually be broken up. But Perdan's new course does bring back most of the former political background as we've known it for so long. South vs North.
