I have been looking at your CLS sequence images, but there are a couple of things I can't understand for TTL.
When does the Commander send the power setting to each remote? I expected to see a longer burst with that data right before the main fire pulse, but it is not there. Maybe the power setting is sent right after the monitor preflash? But if that were the case, it would be sent before the system knew how many groups were out there, so three could not be any adjustment for multiple overlapping groups.