The metrics are stark. Since 2019, South Africa has played 14 Rugby World Cup matches and won 14. Their average winning margin in knockout matches is 11.4 points. They have conceded more than 20 points in a World Cup game once in six years. No team in the tournament's history has won four titles; the previous record was three, held jointly by New Zealand and South Africa before this tournament.

What makes the dynasty analytically interesting is that it has been achieved with almost complete squad turnover. Only three players from the 2019 winning squad started the 2031 final. The system — a specific tactical philosophy built around defensive set-piece dominance, physicality at the breakdown, and a kicking game that controls territory — has proven more durable than any individual within it.

New Zealand, whose All Blacks identity is inseparable from World Cup success, are now four titles to two in the head-to-head since 2019. The psychological adjustment required by that statistic is, by all accounts, ongoing.

"People ask me what the secret is," said Springboks director of rugby Rassie Erasmus. "There is no secret. There is a system, there is discipline, and there are South African rugby players. That combination has always been dangerous. We just finally organised it properly."