Noticed post #605270 was tagged with three artist tags neden, renthan and urovore, but versions at Fur Affinity only credits artist Neden.
http://www.furaffinity.net/view/10384520/
(and http://www.furaffinity.net/view/10377803/ )

The other posts tagged with renthan are the same way (ie. posts tagged with renthan are at Fur Affinity, but only artist credit is Neden ... except for the animated upload which was animated by thewulff aka lobogris ).

Didn't find a renthan at FA, so checked Maho's watchlist at FA and found
http://www.furaffinity.net/user/rentham/

http://www.furaffinity.net/user/neden is now an abandoned account,
with the latest journal post saying they have a new FA account but they won't say what it is because they want a fresh start.

Is artist neden also known as renthan (or rentham) and urovore ???

BUT since neden doesn't want to say what their new FA account ...
should e621 keep Neden's tag seperate from whatever their new artist-name is?

And since the posts tagged with renthan are (at FA) credited only to Neden (except for the animated upload), should the other artist tags be removed from those uploads?

(FA urovore is "voluntarily disabled access to their account and all of its contents.")

Renthan should be removed anyway, as the artist isn't actually called Renthan. If the art is in Rentham's gallery, then add Rentham. I'm not sure what to do with Urovore, but if they aren't credited anywhere then it might be best to remove them. We shouldn't alias artists unless we can find statements by said artists that definitively link them together.