I want to know the answer to the following question:
Where is the likely source of the change to the manipular formation?
All the background I'm provided with is that "This change is sometimes attributed to Marcus Furius Camillus and placed shortly after the Gallic invasion of 390 BC; it is more likely, however, that they were copied from Rome's Samnite enemies to the south, possibly as a result of Samnite victories during the Second Samnite War (326 to 304 BC).". Is that enough to answer the question?
Answer: yes