If justice needed to be done, just as long as it wasn't seen to be done, Oliver was adept at dispensing it - but only if the offender had fair warning and the referee had done nothing. Dirty players are sly kickers, eye gougers, scrotum squeezers. Oliver was not one of them.
But to paint Oliver only as a hard man is to do him an injustice. He was a splendid physical specimen with an athleticism that went beyond what was expected in his day and would be welcomed in today's game. He worked hard at his game and gained the rewards that brings.
Oliver never thought he'd be an All Black. He represented Southland for six years and played four trial matches and four inter-island games before he got the call. He thought the selectors might have found him a bit rough round the edges but, when they finally picked him, they found a hard man with a soft core.
Before the match against Wales in 1978, captain Graham Mourie asked Oliver to talk to the team about how to avoid being affected by the Welsh singing. He told them his son Mark would be getting up in the middle of the night and hunched in front of the television in his pyjamas. "I'll just be thinking of him," Oliver said.
When Oliver was interviewed by the BBC after the game, the interview ended with Oliver fixing his penetrating gaze on the camera and saying, across the oceans, "Hi Mark".