[CealialactBek]

"What is likely to have happened is that the Buddha changed the way he taught. This would be quite appropriate given the rapid change and development of his following over the years. In the early times there was a small group of dedicated, attained followers, while in later years you had many less dedicated, less intelligent followers. In addition the seniors had already learnt the basics thoroughly and wanted more detailed teachings (e.g. the Mahanidana Sutta); and there was increasing specialisation in different areas like Vinaya, systematic analysis (proto-Abhidhamma), or lay teaching.

Sujato's Blog

personally, i do not regard the Mahanidana Sutta as a more detailed teaching. further, i doubt the Buddha actually spoke it because the Mahanidana Sutta simply does not conform with the rest of the suttas about Dependent Origination and therefore must be rejected as Buddhavaca following the Great Standards

many scholars consider that much of the Digha Nikaya, which includes the Mahanidana Sutta, was not spoken by the Buddha

regards