You're not considering the synergy of eidolon pairs. Pairing two eidolons with character attack results in a serious damage penalty at high levels of assault skill. You'll typically want to run a combo: 1 character attack/HP eidolon with 1 elemental attack eidolon. If everyone follows your strategy you won't have a maxed elemental attack friend eidolon to pair your Crom with. Not to mention Blind is a great debuff.