Ordering is shit, just going to be blunt.
Valkorion. 'Thor healing mixed with Exile BM carries them to boss 3, where Outlander uses his Valkorion blast to secure the win. Idk if it'll save them from Valkorion, and I doubt that Exile's "Giga Drain" will do much to Valkorion. On top of that, she and 'Thor are fodder and go down fast before he overwhelms Revan and Outlander.