To write a review, does the author must find some "implication" over the papers it based on?
Example-1:
Suppose author 1 has a theory or a proposal or framework but the language is unclear, not very comprehensible, not pointwise. Author 2 did a lot of improvement by adding short notes, definitions, points, illustrations etc; but all are to reflect the sayings of author 1 (not even a single new implications over author 1). Author2 gave proper reference to author1.
Would the author 2 be convicted of plagiarism/ some other academic misconduct?
Example 2 :
Suppose another situation, Author 1, 2 and 3 has some publications, containing various informations (say respectively information ABC, BCD, CDA)
Author 4 compiled all those informations, also summerised and simplified the language, but again; no new implication is added. Author 4 gave reference to author 1, 2, 3.
Would author 4 be convicted of plagiarism/ someother misconduct due to not having "new implications"?
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Prior study: I have read the wikipedia article on Review article and for Plagiarism. Apparently the wikipedia article on review article says
"A review article is an article that summarizes the current state of understanding on a topic."
But everyone in person I ask about it, emphasise on
ideas of where research might go next
or some other "implication".
Now my question is; is it absolutely a prerequisite to have a new implication if to write a review?