The Garganta being infinite? Sure. Any other realm? Absolutely not.
The Garganta is the only realm with an infinite size statement.
The Japanese statement about the Garganta can be interpreted as either "infinite expanse" or "infinitely expanding." However, using the official translation, which translates it as "endless expanse," the first interpretation is more accurate. Therefore, the Garganta is infinite. (Keep in mind that "infinite expanse" and "infinitely expanding" are two completely different things—check a dictionary.)
EXPANSE definition: an uninterrupted space or area; a wide extent of anything. See examples of expanse used in a sentence.
www.dictionary.com
1. a large, open area of land, water, or sky: 2. a large, open area of land…
dictionary.cambridge.org
firmament; great extent of something spread out… See the full definition
www.merriam-webster.com
Wouldn't this be enough.
Papa Arc is basically the president of Bleach scaling, so if he thinks 2-C Bleach exists, it probably does. And if he thinks Bleach caps at Low 2-C, it probably does. Just wait for his post-Cour 3 revision, and we’ll see how it turns out.
It should be 3 times the size of the observable universe, split into 3 equal parts.