One common enough use of this verb in scientific literature is the following, where mostly "explanation" is concerned, the addition of ideas is not a constructive addition but an addition of known facts that haven't yet been mentioned.
(OALD) idea/story/musical theme
[transitive] develop something to add further explanation or details to an idea, story or musical theme
SYNONYM elaborate
♦ She develops the theme more fully in her later books.
♦ The piano then takes up the melody and develops it.
♦ He began to develop these ideas in a series of paintings.
In your sentence this is not exactly the meaning that is intended; it is not either the following, plain meaning.
(OALD) [intransitive, transitive] to gradually grow or become bigger, more advanced, stronger, etc.; to make something do this
The exact meaning is not found in this dictionary, but it appears in the SOED (Shorter Oxford English Dictionary)
(SOED) develop 2 Uncover, reveal (something immaterial or (obsolete) material); make known, bring to light; discover; detect, find out. Now US. [since] mid 18th century
Since this book seems to be issued from American authors, the "Now US" label, which means "only used in the US nowadays", makes it the most likely meaning (essentially, "reveal", "make known", "bring to light").
This is a definition very similar to the one found in the Merriam Webster dictionary, which is an American dictionary, but that you do not find either in OALD, Collins, or lexico which are British dictionaries.
a: to set forth or make clear by degrees or in detail : EXPOUND
develop a thesis
This is so a fortiori because "aspect" in the case of a scientific phenomenon is not an appearance that could be more or less changeable but a fixed feature that one is not likely to change unless the theory is reckoned with as lacking in some respect.
It is true that the connotations of the plain meaning are not so pleasant but it is also true that the shift from this plain meaning to the relevant one is an accomplished thing. If one finds those connotations too spurious one can use the prepositional verb "to cover", or the more literary and imaged "discover".