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Ask for questions about circuit note(CN-0345)

Circuit note(CN-0345) is an example of multichannel data acquisition system,here there are some questions I want to ask.

1.It says that the maximum sample rate of the system is 1 MSPS in page1, but by calculating the settling time of ADG1207,AD8251,AD8475,AD7982, we get the expected maximum sample rate of the system is then 770KSPS in page7. What's the difference between these two descriptions? Is the maximum sampe rate of the system for one channel or for all channels?

2.Similarly,It says that the channel switching logic is synchronous to the ADC conversions, and the maximum channel switching rate is 1 MHz. Channel switching rates up to 750 kHz also provide 18-bit performance in page1.What's the difference between them?

3.A single channel can be sampled at up to 1 MSPS with 18-bit resolution in page1. If all 8 channels are used, for each channel ,is the actual sample rate 1/8MSPS=125KSPS or 770/8=96.25KSPS?