Jaeger was combating the previous monolithic interpretation of Aristotle with an organic model of psychological growth. Disproving details in Jaeger's account do not ultimately demonstrate that Aristotle did not develop in some way, or present his ideas in different ways in different places. (Preus)
Lachterman, David R., "Did Aristotle 'Develop'? Reflections on Werner Jaeger's Thesis" (1980). The Society for Ancient Greek Philosophy Newsletter. 33.