2. The Buddha referred to pre-enlightened self as a "bodhisatta", but this is understood very differently in the suttas, to the Mahayana understanding of what this means
3. Just because there is no beginning or end to samsara does not mean it does not exist. However, "beings" do not exist to the extent that what we conventionally call a being is nothing more than a continual rising and cessation of the five aggregates.
"Having understood name-and-form, which is a product of prolificity,
And which is the root of all malady within and without,
He is released from bondage to the root of all maladies,
That Such-like-one is truly known as 'the one who has understood'." (Snp 3.6)
"Whether I were to preach in brief, Sāriputta, or whether I were to preach in detail, Sāriputta, or whether I were to preach both in brief or in detail, Sāriputta, rare are those who understand." (A I 333, Sāriputtasutta)