Even if you add in the assistants to the guy's EL, he's still way out of balance. Look at, say, a marilith (I think that's about CR 17, don't have my MM in front of me). There's absolutely no comparassion.First of all, 14th level characters don't have wail of the banshee. Second, even if they did, it wouldn't matter, because the 9th level assistants won't be part of the battle. It'll just be the leader, with all his Circle powers, vs. the party. There's no way he'd be stupid enough to bring his assistants into the battle, especially given that he can exterminate the party quite easily without them.
Spell Focus did not create spells that were out of balance. You can argue that 3.0 Spell Power did, but Spell Focus was fine. And in any case, the Red Wizard's power absolutely dwarfs that of the 3.0 Archmage.
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