Bracketed lowercase letters

Yes, I have read every link about this, and this question might appear to be the same but is a little different based on what I'm asking. CMOS does not elucidate as to what the original text might have been, and I'm trying very hard to understand this principle of bracketed lowercase letters.

Source: Chicago Manual of Style, 17th Edition

13.21: Brackets to indicate a change in capitalization

Chapter Contents / Quotations in Relation to Text / Initial Capital or Lowercase Letter

In some legal writing, close textual analysis or commentary, and other contexts, it is considered obligatory to indicate any change in capitalization by brackets. Although this practice is unnecessary in most writing, in contexts where it is considered appropriate it should be employed consistently throughout a work.

My question: I need your interpretation of what the original passage might have stated based on the example below:

Chicago's example below:

According to article 6, section 6, she is given the power “[t]o extend or renew any existing indebtedness.”

“[R]eal estates may be conveyed by lease and release, or bargain and sale,” according to section 2 of the Northwest Ordinance.

Let us compare Aristotle’s contention that “[i]nferiors revolt in order that they may be equal, and equals that they may be superior” (Politics 5.2), with his later observation that “[r]evolutions also break out when opposite parties, e.g. the rich and the people, are equally balanced” (5.4).

Solution 1:

Just look up the original text. For example . . .

Aristotle said:

Inferiors revolt in order that they may be equal, and equals that they may be superior.
_{Source: circa 350 B.C. POLITICS Aristotle Translated by Benjamin Jowett}

Your paper would say:

Let us compare Aristotle’s contention that "[i]nferiors revolt in order that they may be equal, and equals that they may be superior."

But, as Chicago noted, this device is unnecessary in most writing.