i found this on the net:
Given only to the most experienced Admirals to command, the Poseidon is the heart of any fleet and often acts as the flagship. Its sheer size grants a massive presence whenever it jumps in-system and though only a few have been built, they have already made themselves felt. A total of 16 Starfury flights are carried on board and the highly efficient launching bays can disgorge half of these in a single wave. The Poseidon, while weakly armoured, can withstand many hits before being crippled and is equipped with the most sophisticated Interceptor system within the Earth Alliance.
so, 16 furys are not that much, are they? i mean the omega can carry 36 if you believe wikipedia and b5 tech. so, where would be the sense to build a ship like that just a few years before the omega? all this speaks for the poseidon beeing an older ship i guess, maybe with a prototype rotating section.
also, that the ship is talked about as weakly armored and still being able to withstand a few hits tell me that it must be older as one minbari hit would crush such ships.
anyway, i guess we can say that the ship was used mostly before the minbari war and during, but not after. that would also explain why we never saw any of those ships during the series, we could tell that all were destroyed during the war and after the war the omega took its place.
what do you think of this?