I figure they're an alt rather than a troll, because people don't come into a community THAT hot unless they've been a previous member.
Newbies don't want to cause too big a splash because they want to be accepted as part of a group.
Trolls - despite mod beliefs to the contrary - want to play the long con, so will get their account out of 'danger zone' territory with innocuous posts elsewhere to give the account some credibility ("Wow, last years GOTY was pretty great guys") before going full "Would you kill a gay black man to save two white women?"