I've recently been working through the commentary to the Pabbajjaa Sutta and Padhaana Sutta myself. Just to add to the answer to your question already posted, the reason that the commentary says that Rev Aananda completed the Pabbajjaa Sutta is this. The Pabbajjaa Sutta begins: 'pabbajja.m kittayissaami yathaa pabbaji cakkhumaa' meaning 'I will describe how the one-with-vision [i.e. the Buddha] went forth'. The commentary understands the speaker here as being Aananda, in accordance with tradition. So the commentary regards the whole sutta as having been spoken by Aandanda. The last line would therefore have been spoken by Aananda, though he is quoting the Buddha.