Fomuna's weakness is affecting both fields. You can't take advantage of your opponents field being messed up if you have to spend actions moving yourself back into place too. If that weakness is removed, it could be a powerful effect.
However, we probably won't get JP effects. I for one really really don't want to see a 1 SP Wrath of the Sea Lord, even if it turns out they have to be exactly level 4. But I won't get into the reasons here, it will just cause another big return debate.