Odin is just considered the DD 2 hour avatar, yes he is rarely used and could use an update to bring it up to par with the game as of now, but just giving smn's bahamut to do damage much like Odin is not going to fix Odin or fix the situation.
Also why talk about Bahamut when SE has stated back in 06 "
http://www.playonline.com/ff11us/top.../060330_2.html " when they said he would not be an avatar.
Lets discuss something that's about to change summoner in the upcoming update instead of something that's not even close to being implemented to the game?
If you want a DD avatar Odin should be changed to a controllable Avatar.