Reclocking cleans digital signal and makes it easier to read when the dac get the data puts it in a buffer then does a bunch of other things before final conversion ,in good dacs a lot of information way over my digital knowledge base .
It is not over my digital knowledge base. This "cleaning" the digital signal is a very suspect statement (not by you, but claims by people selling it). Even the cheapest streamer has a very clean digital signal output, with potentially the exception of some electrical noise which is not difficult to filter out. That can in rare instances affect SPDIF, but a good DAC should already isolate SPDIF. It will not effect the data, but it may introduce small amounts of jitter, something most modern "good" DACs eliminate without much trouble. We are talking streamer level jitter now, not the old large amounts of jitter from CD players. With USB, this is not remotely an issue. Your USB will work or not. If it works, the data is getting there, totally uncorrupted, and as noted, the timing on USB has no impact on the DAC clock.