The almighty is irrelevant in this discussion, as the Red Legion have no way of knowing which system to use it in to maximize its threat to the Covenant (a group of multiple species from different planets, possibly and very likely in different systems) whereas with Earth, they already knew since the Cabal had been on Mars already. Also, there is [b]no way in hell[/b] the Red Legion has [i]more[/i] ships, or even [i]better[/i] ships than the Covenant. Unless new canon info is released about Cabal ships, there is nothing to prove they can output more destructive potential than ships that can glass planets and whose plasma torpedoes can melt through multiple layers of Titanium-A ship plating (I'm ignoring Leviathan because it's not [u]controlled[/u] by the Red Legion, and I'm only focusing on them, as per the topic question). Also, let's see how well the Red Legion fare against scarabs. tl;dr Covenant stomp very easily. Damn, now I want to go back and read my Halo novels.