Except that updating via WSUS was thoroughly broken in 14393 initial release and only became usable after many updates. So if you're doing a clean install in a WSUS environment, helps to start with something that will update correctly.
Just download the last CU once, put it in a shared folder and update anything you need. Then set up WSUS
well I think each one have your own manner to make things, myself think and make my "things" different so whenever that I need reinstall Windows 10 for some reason all is faster and without problems related to updates at least until now; I have one folder named as LTSB 2016 Updates in another partition and already know that updates M$ launch for all users then I download all updates via catalog.update.m$ and store in there after reinstall Windows normaly in sequence install all updates ( until now are only 5) but seem now things are changed related to updates then waiting tomorrow and see which actions arrive for us