Nonoise,
Today, most, if not ALL, USB DAC use asynchronous USB architecture which uses a local clock to clock in the data, so data jitter is no longer an issue. Therefore you have to be able to explain at least in theory why data jitter would affect the clock. In other words, the data is buffered in a memory bank so jitter coming in from the USB cable is neutralized.
I am playing the devil advocate to force you to explain.
Today, most, if not ALL, USB DAC use asynchronous USB architecture which uses a local clock to clock in the data, so data jitter is no longer an issue. Therefore you have to be able to explain at least in theory why data jitter would affect the clock. In other words, the data is buffered in a memory bank so jitter coming in from the USB cable is neutralized.
I am playing the devil advocate to force you to explain.