@Arc7Kuroi; So about two possible examples that could hopefully make this better.
1)
Yammy uses his Soul Suck to suck out the souls of all the humans in the nearby vicinity, but Tatsuki has a higher amount of spiritual energy than all the average humans in the area, which allows her to survive it. Tatsuki obviously isn't stronger than Yammy so where she can negate his abilities like Aizen could, but having spiritual power does provide her with an advantage.
2)
Don is able to stand within Aizen's presence for a while being feeling the suffocating effects of Aizen's passive energy/aura. Again, this isn't Power Nullification. A spiritually weaker human would have lasted even less time, and if Aizen was even stronger than he was in that scene, then Don would have lasted less time.
I saw earlier in the thread that you said how we treated Aizen's EE was without precedent - these two scenes are what I consider to be comparable and "precedent". I understand if you see them differently, but this is part of the reason why the current justification for Aizen makes sense to me.