I'm intrigued by the gap between the northern and southern corridors. The coverage maps clearly show this gap exists due to the overlap with POR. However the area of the gap would be at the very edge of coverage with POR, with the satellite very close to the horizon. It is not inconceivable transmissions in this region would only be picked up by IOR. In particular a ditched aircraft in the water may well have difficulty transmitting to a satellite close to the horizon.
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NB I would love to see similar 'corridors' for the various pings between 1.30-8.11am. This would help rule in/out various flight paths being speculated.
As much much as I'd also love to see these possibilities, the chances of InMarSat releasing both raw dumps of their telemetry and handshaking data, along with ultra-high resolution keplerian elements for the space platforms in orbit responsible for receiving the data, this will remain a mystery to the lay person: like me.