As we learn from the well-known references to the existence of the bhanaka tradition existing until later periods and from several other sources, oral tradition continued to exist side by side with written scriptures for many centuries to come. This, the so-called writing down of the scriptures[8] was only the biginning of a new form of tradition, and the innovation was probably opposed by the more conservative monks. As with many other innovations, it was only after some time that it was generally accepted. Therefore, it was much later that the records of this event were transformed into an account of a “council” (sangayana or sangiti) which was held under the patronage of King Vattagamani.
So when we say that the texts were “spoken by the Buddha”, we mean it in this non-literal sense.[7]
According to A. K. Warder, the Tibetan historian Bu-ston said that around or before the 1st century AD there were eighteen schools of Buddhism each with their own Tripiṭakas transcribed into written form.[10] However, except for one version that has survived in full and others, of which parts have survived, all of these texts are lost to history or yet to be found.[10]
About disagreement on vinaya and sutta
According to several accounts, after the recitation had concluded, a group of five hundred monks returned from the south, led by a monk named Purāṇa. When he was asked to approve of the dharma and vinay a that had been codified by the cou[...x]
ncil, he declined, saying that he preferred to remember and retain what he had heard directly from the mouth of the Buddha rather than what had been chanted by the elders. Purāṇa also disputed eight points of the vinay a concerning the proper storage and consumption of food. This incident, whether or not it has any historical basis, suggests that disagreements about the contents of the Buddha’s teaching began to arise shortly after his death.
The Buddhist Canon was compiled by a number of monks, and internal evidence makes it clear that not every text that has come down to us in the Sutta Pitaka can have been recited by Ananda at the First Communal Recitation. The texts contain many and sometimes discrepant accounts of such central topics as meditation. As I have written elsewhere, one likely reason for the discrepancies is that in the course of a preaching career lasting forty-five years the Buddha formulated things in various ways and perhaps even changed his mind (Gombrich, 1990:9). But another reason I posit for discrepancies is that monks were arguing about these topics and that the texts sometimes preserve more than one side of an argument. These two processes are not mutually exclusive: scholastic literalism can provide ample matter for debate, and argument can often degenerate into nit-picking! (Gombrich 2006, pp. 96–7)
Spread
So called Buddhism spread across Asia through networks of overland and maritime routes between India, Southeast Asia, Central Asia, and China. The transmission of Buddhism to Central Asia and China corresponded with the development of the silk routes as channels for intercultural exchanges.
That is exaclty what God does not wanted to happened during the generations before Christ.
To read more:
33: The Ten Kings
Early buddhist text
There are early texts from various Buddhist schools, the largest collections are from the Theravada and Sarvāstivāda schools, but there are also full texts and fragments from the Dharmaguptaka, Mahāsāṅghika, Mahīśāsaka, Mūlasarvāstivāda, and others.[13] The most widely studied early Buddhist material are the first four PaliNikayas, as well as the corresponding Chinese Āgamas.[14] The modern study of early pre-sectarian Buddhism often relies on comparative scholarship using these various early Buddhist sources.[15]
In Mahāyāna schools
The term Tripiṭaka had tended to become synonymous with Buddhist scriptures, and thus continued to be used for the Chinese and Tibetan collections, although their general divisions do not match a strict division into three piṭakas.[35]
Mizuno, Essentials of Buddhism, 1972, English version pub Kosei, Tokyo, 1996
Why tripitaka
THE RELATIVE ANTIQUITY OF THE TRIPfTAKA.- The classification of the writings into three Baskets merely sanctions the existence of three different specialities within the religious community the objects of which were respectively the doctrine, discipline and scholasticism. Indeed, very early on the monks specialized in one of these three disciplines. The canonical writings inform us that, alongside the religious who were famed as instructors (dharmakathika), meditators (dhyiiyin) and folklorists (tiraicakathika), there were bhik~us versed in the stitras (siitradhara or suttantika), others in the discipline (vinayadhara), and still others in catechetics or summaries which are the core of scholasticism (miitt:kiidhara): Vin., I, pp. 119, 127, 337, 339; II, pp. 8, 55, 75-6, 299, 300; Dfgha, II, p. 125; Majjhima, I, p. 221; Anguttara, I, p. 117; II, pp. 147 sq.; 169 sq.; III, pp. 179, 361 sq.; IV, pp. 140-3; V, pp. 16, 349, 352.
Ashes
The ashes of the Buddha were buried in stupas built at locations associated with important events in the Buddha’s life including Lumbini (where he was born), Bodh Gaya (where he achieved Enlightenment).
Relics associated with Buddha
According to Mahaparinibbana Sutta, after his death, the Buddha was cremated and the ashes divided among his followers.