This comes in the sequence of the "Anapanasati" discussion on the pali forum. There, bodom says:
"I would say the first two steps in the first tetrad refer specifically to mindfulness OF breathing. There is some doubt regarding the third and fourth steps due to the ambiguity of the term "whole body", whether it refers to the breath body or the physical body. The second, third and fourth tetrads corresponding to feelings, mind and dhammas, are specifically mindfulness WITH breathing .This is supported by Buddhadasa and Analayo who both say that "Awareness of breathing in and out forms the background to each step." See Analayo's Satipatthana commentary along with Buddhadasa's Mindfulness with Breathing."
And I agree. But that does not seem to be the established position of the Mahavihara.
Another type of discussion that might arise is the dating of texts acording to language analysis, which is not apropriate in the Classical forum.
He turns his mind away from those phenomena, and having done so, inclines his mind to the property of deathlessness: 'This is peace, this is exquisite — the resolution of all fabrications; the relinquishment of all acquisitions; the ending of craving; dispassion; cessation; Unbinding.'
(Jhana Sutta - Thanissaro Bhikkhu translation)