Though as we have our famous 17 outfield positions approach it is possible that we’ve assessed him as not just a FB/WB but capable of more, just as KLP clearly has the skill set to play superbly at FB while nominally being a winger.
It depends on whether the player is himself open to being developed according to skills, aptitudes and team needs rather than insisting on his identity being tied in with a particular position. In pretty much his first public interview on being appointed head coach Keith said what he loved about the squad was how coachable they are.
Maybe Diouf fits this mould too.