NeoFit;
The timing sequence is carefully described by the BEA in its Interim Report #1.
Possibly a gap or two was caused by the system reverting to its prime task of trying to do an auto-connect with Dakar Oceanic using ADS-C. I'm sure that the Dakar log would have recorded another "failed connect" if that had occurred.
The BEA in its reports has made no mention of satellite traffic queuing, so that can probably be discounted.
You are right about the speed! RTTY, Morse code and then semaphore comes to mind!
mm43