Yes, your missing something. Poisoned Weapons don't always wound on the poisoned value, if you'd normally wound on something less then you'd roll on that instead, and in addition you even get re-rolls to wound! An Agonisor with + 2 Strength would be wounding on 3's with re-rolls to wound.
Agonisor + Soultrap is better then Huskblade, because most CC HQ's would demolish you by virtue on having a 2+ save, be to hard to wound, or have invulnerable save/Eternal Warrior, or in the case of Chapter Master Smashface, all 4 at once. At least with the Agonisor you will send him into things he can beat, for example mulching MEQ's, instead of deluding yourself he can beat an Overlord.
Unless you have weighted dice, Agonisor every time.
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