Two things:

1. Blue Carbuncle should also be on Obey. Garuda-egi is just an upgraded version of it mechanically, so they share the same moves (just renamed). That means Carby also has Contagion (named Shining Emerald), so for those lvling SMN from scratch it's good practice to get used to keeping Summon I on Obey, period.

2. No reason to replace Ruin when you get Ruin II because that's not its purpose. If you have no reason to move, or to weave in an oGCD like Fester, then you simply spam Ruin I until DoTs need to be reapplied.

Other than that, seems all good so far.