Western scholars: Did the Buddha not speak the Digha Nikaya?

Recently, Bhikkhu Sujato wrote: > It is no coincidence that these elaborate texts are often addressed to > the brahmins, who were the self-proclaimed spiritual leaders of the > time. The brahmins were the custodians of the most sophisticated texts > in ancient India up to this time, the Vedic literature. It seems that > one aim of the Dīgha was to impress such learned men. > >The Long Discourses: Dhamma as literature and compilation There also this introduction on _Access to Insight_ (which cites Bhikkhu Bodhi and Joy Manné): > The "Long" Discourses (Pali digha = "long") consists of 34 suttas, > including the longest ones in the Canon. The subject matter of these > suttas ranges widely, from colorful folkloric accounts of the beings > inhabiting the deva worlds (DN 20) to down-to-earth practical > meditation instructions (DN 22), and everything in between. Recent > scholarship suggests that a distinguishing trait of the Digha Nikaya > may be that it was "intended for the purpose of propaganda, to attract > converts to the new religion."1 > > 1. Bhikkhu Bodhi, Connected Discourses of the Buddha (Somerville, Mass.: Wisdom Publications, 2000), p.31, referring to Joy Manné's > "Categories of Sutta in the Pali Nikayas and Their Implications for > Our Appreciation of the Buddhist Teaching and Literature," Journal of > the Pali Text Society 15 (1990): 29-87. > >Sutta Pitaka The Basket of Suttas Is there evidence (such as contradictions with other suttas) suggesting the Buddha did not speak the Digha Nikaya? In there any evidence in the suttas where the Buddha said he would teach a different modified Dhamma ("propaganda") merely for the purpose of converting Brahmins & other outsiders? Is there any evidence in the suttas showing the Buddha was "flexible" in his teaching of Dhamma? Or do the suttas show the Buddha wished his teachings to remain consistent & clearly representative of what he taught?