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irenaeuslyons
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Stylistic differences would make convincing argument against someone claiming a single translator for all the books. That is not the case here.The story about the translation of the Septuagint (in, for example, the Letter of Aristeas) applies to the translation of the Pentateuch, not later books. If you read Greek, you’ll immediately notice the stylistic differences between different Septuagint books; they were clearly translated by different groups.
A quick introduction to the theories about the translators of Septuagint Isaiah can be found in Moises Silva’s introduction to his New English Translation of the Septuagint:
ccat.sas.upenn.edu/nets/edition/33-esaias-nets.pdf
If you are interested in a more detailed discussion, I can recommend Seeligmann’s book on the subject; you can read some of it on Google Books; and it is now back in print.
If you are interested in learning more about this, I recommend reading Moises Silva’s introduction to his New English Translation