I have questions regarding the results of my brainstorming. I hope everyone can give their thoughts.
As you all know, Adam have the Quincies power. My intention of getting that other than The Almighty and Quincies abilities is because Adam's army need a power up and Quincies power is the most suitable to fix that problems.
Why?
1. During my research about Quincies, I learned about BG9. It's not clear if he is human soul put into a robot or creation of real Sternritter K. But what i do know is robot can be stuffed with soul and become a Quincy.
2. Just imagine having a army of robot the strength of an average Sternritter and analytical power of BG9?. Slap a hive mind and they will analyze, lead and adapt on their enemies and produces countermeasures on the spot like Ex-Machina from No Game No Life 0 with endless growth potential as they grow stronger from each battle with richer experience, battle tactics and combat methods.
3. Part of the reason is as many pointed out, Adam's System is very useful in logistical point of view to supply army. His Crafting function alone allow him to create anything he have blueprint of and those created item can be Augmented with various Augmentation(refer aux chapter).
With this, Adam can create even army of basically mechanical angels that can use Vollstandig too, which will fit his current image of his ultimate form (6th anniv Aizen) that someone suggested.
Of course this is too OP and I put in place a limiting factor. To create a soul for a robot to be granted Quincy power, Adam will splinter fragment of his soul like Yhwach to create souls. However, in time of need, he can use Auswählen to regain back the power he gifted away that is cultivated and grown stronger by his army to give himself a power boost.
Aside from robots, I also have uses now for the Cursed Childrens he saved. Although, with Adam's personality. Flesh and blood soldiers are elites and mechanical soldiers are disposable cannon fodders.
Also, lastly. I have something to clarify regarding Adam's personal Zanpakuto ability which I think many misunderstood or don't grasp my meanings.
When Adam devour someone to gain their power. He also inevitably gain some of their personality tied to the ability he taken. Like Kyoka Suigetsu make him retain some of Aizen's cunningness and indifference in pursuing his ambitions or Yhwach's The Almighty that influence Adam with Yhwach's ruthlessness for revenge.
Worry not that Adam's core personality will not change. But there will be change in his methods such as being absolutely ruthless to anything that is labelled enemy or becoming apathetic to the suffering of unrelated people for the sake of his ambitions or goals. The effect will be like having the people he devoured talking to his mind when making decisions or slowly and subtly influencing his action and thoughts.