I didn't say he was the most powerful summon either; I know that, I'm not new to the FF series. I said "one of".
What I'm saying is that I do not care that Bahamut was not included as a summon, or for that fact neither was Ifrit, Shiva, etc. So many people say that Final Fantasy will be doomed and die out soon because they aren;t original anymore. Now they go and add in Espers for the Zodiac signs, which all kick as in one way or another, and people are still bitch'n, while Square-Enix tries to mix things up a bit since we hadn't seen this since Tactics.
So yes, I already knew Bahamut was not the most powerful Esper in all of the games in the FF series and I love FFXII the way it is. Repetition is BORING and will eventually lead to killing the series. Change is good sometimes.