They were still being investigated as part of the usual Swedish process with involves an interview before charges are laid against the suspect. Assange hiding in the Equadorian embassey short circuited all of that. As for him needing to be sent to Sweeden before he could be legally sent to the USA. Why would they need to do that? Under the terms of the current extradition treaty we have with the US if they wanted him it would have been redicolously easy for the Americans to have got him soon after they start the process as seen with those Nat West bankers. Something the US still hasn't done with Assange despite the changes in Administration.