Very good. I would not fret too much over AN 5.28. Redaction being what it is, there’s a high chance that pericopes were simply copied from suttas with the full context into those without. My view is that the anaphoric pronoun likely originated in a discourse that had the awakening factors precede the jhanas.
Take a look at @Gabriel s essay for a compelling suggestion of an older meaning of the “body” (kāya).
