Well potentially the Karilac could drive the Nur'Xal ships away from their positions over the fortress.
If they manage, no amount of groundside defenses can stand against heavy orbital bombardment.
Granted It'd be a though slug but the results could be worth it for the Seraphim and their alies.
They'd best do it soon though since I fear the Nur'Xal won't be on the defensive for much longer.

Meanwhile the Kimo will just quietly sit on the sidelines and be about their usual buisness.