There’s plenty of Rangers fans out there who feel that the club failed to kick on post-55, including former chairman Dave King. The South Africa-based businessman stepped down from his role in charge of Rangers just over four years ago. Rangers would go on lift 55 the following year but despite that, Dave King reckons the club went backwards under the stewardship of Douglas Park and Stewart Robertson. Rangers’ biggest individual shareholder – via his company New Oasis Asset Limited – King has been out talking in the Rangers Review this week about that downturn after winning a first title in te…