My concept may have changed a bit but this was the general idea I had.

The Idols would act the summons you can actually take out as pets when on SMN while the Cracked idols are only a pact which allows you to summon an avatar to do an attack for you. With that in mind I think it would actually be possible to use the put the Primals as summons but only through the Evoking kind rather then the summoning kind.

The reason why I condensed the abilities learned on Evoker was cause the progression felt like each avatar would always have the same set of abilities. It just feels like each avatar would be a copy of one another but with a different elemental attack or buff or debuff with little variation between each one.

With that in mind the way I imagine the Idol/Cracked Idol concept is as followed. Based on the summons obtained in FF4 I came up with the following cracked idols.

Chocobo:
Lv 1 "Chocobo Dash" -Grants AOE sprint effect- MP 10-50, Duration 30 seconds, Recast 2mins Idol Cooldown: 30 seconds
Lv 5 "Chocobo Kick" -Deals Moderate Single Target dmg- MP15-150 Recast: 30 seconds Idol Cooldown: 30 seconds
Lv50 "Fat Chocobo" -Deals AOE dmg- MP 500 Recast: 5 minutes, Idol Cooldown: 2:30

Shiva's Rage:
Lv 1 "Axe Kick"
Lv 10 "Blizzard"
Lv 30 "Double Slap"
Lv 50 "Diamond Dust"

Shiva's Ward:
Lv 10 "Frost Armor"
Lv 30 "Sleepga"
Lv 50 "Diamond Storm"

Ramuh's Rage:
Lv 1 "Shock Strike"
Lv 10 "Thunder"
Lv 30 "Thunderspark"
Lv 50 "Judgement Bolt"

Ramuh's Ward:
Lv 1 "Rolling Thunder"
Lv 30 "Lightning Armor"
Lv 50 "Shocking Squall"

Goblin:
Lv 1 "Goblin Punch"
Lv 10 "Pilfer" Chance to steal an item
Lv 30 "Goblin Rush"
Lv 50 "Goblin Dice" Deals a Random effect

Cockatrice:
Lv 1 "Petrifying Beak" Single Target Chance to Petrify target
Lv 10 "Sound Blast" AOE chance to lower INT and Silence
Lv 50 "Petrifying Break" "Deals bonus dmg to target that is petrified"

Bomb:
Lv 1 "Self-Destruct" AOE Fire dmg Idol Cooldown=5 mins
Lv 20 "Rage" Single target attack boost on ally Idol Cooldown=30 seconds
Lv 50 "Meltdown" Heavy AOE Fire dmg Idol Cooldown=10 mins

Mindflayer:
Lv 1 "Mind Blast" Single Target dmg with chance to deal paralysis and DoT -non elemental-
lv 10 "Mind Purge" Single Target Dispel
Lv 30 "Immortal Mind" Single Target MAG ATT/DEF buff
Lv 50 "Reporbation" AOE Dispel

Above is a list of 9 cracked idols, through my idea you would only be able to have 5 cracked idols active at a time. Each Cracked Idol has it's own Ultimate Move which brings it to a 5 minute cooldown when used basically a Cracked Idol has 2 recast on it. There's the ability recast which is how long til you can use the abiilty again, and the fatigue from using the ability which is how long you have to wait til you can use it again.

With the above Shiva/Ramuh have two types of Cracked idols, one that's focused on offensive and the other that's defensive. These idols would be unique so you would only be able to carry one of each however all of the above can be stacked. So you could have a 5 cracked idol set of all goblins if you wanted to. But ya the basic idea behind the Cracked idol is you activate it and it'll allow you to choose from a set of abilities based on your lv. At max lv an Evoker and Summoner would have 6 moves they can use at a time. Even though a Summoner can obtain 2 Idols they share the same 1min cooldown with their ability activation unlike the Cracked Idols which are all on seperate timers.

As for the idols their abilities would look like this:

Carbuncle: (All recast 1min minus 5 minus recast from Searing Light on Evoker) -Below Recast are for summoned state)
Poison Nails Recast 15 seconds
Healing Ruby Recast 5 seconds
Shining Ruby Recast 3mins
Meteorite Recast 30 seconds
Glittering Ruby Recast 30 seconds
Divine Ruby Recast 15 seconds
Holy Mist Recast 1min
Soothing Ruby Recast 1min
Lv 50 "Searing Light" Idol Cooldown=5mins

Fenrir:
Lv 1 "Moonlit Charge" 15 seconds
Lv 10 "Crescent Fang" 30 seconds
Lv 20 "Lunar Cry" 30 seconds
Lv 30 "Lunar Roar" 1 min
Lv 35 "Eclipse Bite" 45 seconds
Lv 40 "Ecliptic Growl" 3mins
Lv 43 "Lunar Bay" 1min
Lv 45 Ecliptic Howl" 45 seconds
Lv 50 "Howling Moon" Idol Cooldown=5mins

Diabolos:
Lv 1 Camisado 15 seconds
lv 10 Somnolence 30 seconds
lv 20 Nightmare 1min
lv 30 Nether Blast 30 seconds
Lv35 Ultimate Terror 1min
lv 40 Noctoshield 3min
Lv43 Night Terror 1min
Lv45 Dream Shroud 3min
Lv 50 "Ruinous Omen" Idol Cooldown=5mins

Other Potential Idols:
Alexander
Cait Sith
Yojimbo
Magus Sisters


When using an Idol like an Evoker the cooldown would always be 1min regardless of the ability used, however when you use their AF it would be a 5min cooldown on the Idol that's used and 1min on the other Idol if you are on SMN.

Idols have the advantage of having a wider range of abilities as well as the ability to be summoned. While an avatar is out the abilities they can use would all have unique cooldowns allowing you to use their abilities more often however your MP pool would decrease faster.

Perhaps one thing that could create a distinct difference between SMN and Evoker is that during the SMN state you can't use cracked idols since you have to focus on keeping the physical form of the avatar out. If this is done then both SMN/Evoker can have the same MP pool.

Basically a SMN's arsenal would be composed of 2 idols, they can have one out on a time and still use the other idols abilities with a 1min cooldown. The benefit of using a Summoner would be from the ability to add an extra attacker as well as have quicker access to their abilities.

An Evoker on the other hand would have this advantage, they would have access to 1 Idol as well as 5 Cracked idols which give them 6 ability sets to work with. An Evoker can spread their abilities to a wider range while a SMN focuses on one/two elements. A Summoner is able to use an idols abilities quicker while an Evoker would have to wait 1min between each ability.

But ya, I just think that if they did it this way they would be able to make the abilities more unique between each idol rather then each avatar having the same set of moves basically with slight variations between them.