Gallus - From your list, the only thing I have to point out is from #6 - I don't believe Ifrit and Garuda only have one action. During the LL, they showed how they were crunching together Egi abilities, and with the example, they showed one ability from each Egi combined into a single ability called "Egi Assault 1." This leads me to believe it's only the first one, and that we'll likely have multiple Egi Assault abilities.

Iscah - I'm mixed on this; I don't remember "beating" Bahamut as part of learning his Egi. Instead, if I'm remembering the quest correctly, we went to the site of Cartenau and learned to draw from the aether there to Trance for the first step. We didn't fight Bahamut when we learned Summon Demi-Bahamut either; we instead fought the Sari-Egi and the Evocation Matrix. We could be pulling something similar with Phoenix - being an egi related to fire/light/life, it could be that our trip to the First helps us attune to a similar type of aether in order to learn how to summon Phoenix.