Forum:Who should get the Bonus?

Who should get to use the valuable sphere?

So I'm going to be getting a sacred jewel verelp the sy very soon, and I'm debating over who in my party to give it to. Each unit greatly benefits from it, but I don't know who's benefits will help the squad the most. My squad consists of:

Leader - Blade Hero Zelban - Max Oracle

Thunder God Eze - Max Oracle

Fire God Lava - Max Guardian

Holy Empress Luna - Max Breaker

Dragon Warrior Zephu - Max Guardian

I'm debating whether to give the sacred jewel to Lava, Luna, or Zelban, since they have some of the greatest benefits from the sphere, but I want the opinions of others to help me decide.