Re-Rolling skins with no skins available?

So what happens when someone owns all skins obtainable including all legacy skins, gemstone skins, and prestige shop skins with exception of some limited skins and some limited event skins such as prestige event skins and they re-roll skin shards? Do they just get permanent versions of skins they own or are some of the limited skins possible to obtain?
Best New

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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