I don't think you are considering the possible increase in damage out put from constantly recharging your grenades. We really won't know until we test them tho. Big questions that need to be answered are: do orbs charge grenade and melee simultaneously? How many orbs does it take for a full charge of grenade or melee energy? Does the orb perk stack with helmets that recharge ya little energy when you pick up an orb? I think you are also forgetting that storm callers have a perk that requires all 3 abilities to be charged simultaneously to activate.