Change to the system if possible from games of old how summons are I just feel with the current system how would the other summons be put in place we already have

Melee = Ifrit
Range = Garuda
Tank = Titan

I am not sure how the others would be put in place so I have this idea to revamp the summons a tad bit give them stance's such as

Aggressive Stance = Offensive ability's to there corresponding elemental
Defensive Stance = Ability's that take aggro or de-buffs from the caster
Supportive Stance = Ability's to provide buffs like resistance to elemental's of its nature to the caster

With this system in place every summon could be used with out being restricted to a role and add a sort of use to every summon even if its just people who like using say titan because of earth ability's rather then being forced to use Garuda.