Hi Patrick,
I would say that the issue isn't over God giving up one of the 'omnis' as you call them. The issue would be if things could occur outside of God's providence or domain like Adam sinning without God being aware of the possibility or occurrance. This would mean that God might not be able to carry out His purposes where free agents were involved. Scripturally this isn't the God we know.
One structure would be founded on the shifting sands, the other on the rock. If you prefer 'warfare' model(Godrulz) over 'shifting sands'; then you would need to convince me that there is an entity in existence who might successfully wage 'war' on our Lord. An equal.
The warfare (Gospels/Jesus/Boyd) vs blueprint (Calvin) model is not a Star Wars dualism. Satan opposes the will of God, but he is not an equal (omnipotent vs impotent).