@whpS0nn - I went the other direction since the DA is what we have on record and it has no name change, and the Tumblrs are linked from the DA. So, for now, the Tumblrs seem to be a “side brand”.
@whpS0nn - Done! Thank you for putting that together.
Both TWOSeven and Avra are from YCH.commishes; it was TWOSeven originally, changed to Avra later. (Here is a cache from Google, putting it here to work like an archive.)
As for artist:aurorapalette, it was only used on >>1515471. (I tagged the other to mark same artist; I do this when I don’t feel like requesting.) I don’t know how this one came, though the source leads to the same YCH.commishes account, still.
Again it’s his standard nsfw account name, but on derpy he doesn’t distinguish between sfw and nsfw. Check a number of images credited to him on this site that are nsfw to see that he’s linked back to a doesnotexist account.
artist:chocoscotch <-> artist:kure
Not sure if the post got deleted after its implementation, or if it’s really two separate artists that commonly worked together, but it’s the first time I’ve seen an implication instead of an alias.