Summoners useless in 24mans?

[Mythrellas]

How on earth do you figure that? Out of 24 people, only 18 are potentially debuffing, the other 6 are healers. BLM's only have 1 real debuff, so they are the absolute least offenders. BRD's should have plenty of room to share with the tanks at that point, none of the other DPS really have anything significant or long lasting that I'm aware of.. (Yeah a lot of abilities have debuffs attached, but I can't think of any that last terribly long.)

First of all Scholars cast a buff on the tank that puts a debuff on the monster that he's fighting.

Secondly that leaves 30 debuff slots for 18 playe s which gives each player less than 2 debuff slots, and most every class that does damage has 2.