Yeah Mercury/Rockslide/Tag were pretty filler at that point.
I think the book would've been more focused if they had even just kept the squads to 5 like originally planned. Icarus was sweet but kind of an unneeded addition to an already full cast.
Wind Dancer, Elixir, Prodigy, Surge, and Dust (swap) vs. Hellion, Wither (swap), Rockslide, Mercury, and Anole would've been perf.