So completely random theory time:
From what I'm getting the reason we're not dust or at least aged to death might just be that our pseudo immaterial nature makes us resistant (or maybe even entirely immune?) from keeling over due to sheer passage of time alone.
In any case, whatever it is that saved us there, it does not prevent said passage of time:
You feel strange. The crown is too heavy in your hands; at times the distance seems to stretch, a single steps takes you a minute, a few yards several hours. But at the same time you don't feel quite like it's true; your body is at odds with your mind, and as you instinctively try to reconcile this contradiction your head starts to ache and throb.
And similarly in the most recent update our hands went numb from touching the thing.
So, effectively, we get our growth accelerated because we have more time to "mature" than objectively passes but don't suffer the consequence of going all wrinkly and brittle because that's not a thing we do, apparently.
The major sticking point is that I have no freaking idea how strengthening Cirrucci (or others) via proximity would come from that though I suppose the in-universe explanation for their growth doesn't necessarily have to be that closely linked to the justification for our own advancement.
Still, I can't help but feel that a single explanation for it all would be more elegant and therefor can't help but hope on some level that I'm actually wrong here.
Edit:
Also jumping ship to Lamenting. After reexamination it's a bit more distinctive and cool of an ability.
[X] Cirucci wants you to gather useful information on one of the lower-ranked Espada.
-[X] Yammy should be the weakest Espada and challenged by others for the spot, yet he seems to be coddled too much, to be far too "safe." Observe him and find out what his deal is.
[X] Plan Controlled Moth
- 500 XP to Reiatsu Control
[X] Lamenting Cero