As usual, Sinky, you do not understand the systemic nature of liturgy--odd, given your profession.
All elements are consistent with the nature of the Sacrifice and the Body/Blood PRESENT--of God, no less.
TA's explanation is not only cohesive, it's systemically consistent.
Alas, yours is eccentric. Don't write nested if's, Sinky.
Some thought the same about TA's understanding of human conception. Alas, he turned out to be wrong.
Aquinas would no doubt disapprove of "Communion Services in the absence of a priest or deacon," but they are a reality and a necessity in today's Church.