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Just remember that you need to have already reserved your copy of Windows 10 before doing the upgrade manually via the media creation tool.
Absolutely NOT correct. I reserved absolutely ZERO copies when I upgrade 30+ machines. All of them worked just fine using the upgrade tool.
Downloaded the ISO, installed off that. No issues at all.
I've upgraded a number of machines using a USB drive doing a clean install
You can't "upgrade" a machine by doing a clean install, you first have to do a traditional upgrade from an eligible OS first, and activate, before performing a clean install on that same hardware. So, perhaps you could clarify what you intended to say...