I don't think Rey's compositions in these shots mean anything besides a good, balanced frame. Only J.J. or the DP Can say for a certainty, but come on, guys.
How does the Cineform codec have "Support for ProRes, DNxHD, DPX, uncompressed, and virtually all RAW formats"
That's not actually the zone system, which operates in terms of stops of light, not steps of latitude; as in doubling the footcandles to achieve a stop of light. Zone 5 should be 18% gray.