"Their record backs up that belief: just three defeats since the last World Cup while, when you look at South Africa's recent results, they appear to be on the wane. It should make Saturday's semifinal a foregone conclusion but a meeting between the game's two superpowers never is."
Henry says South Africa will be at their best at Twickenham in just the fourth meeting between the two great rivals at a Rugby World Cup and the first ever semifinal match-up, however stating that they don't look like contenders to win the tournament.
"They look to have neither the form nor the momentum of a serious World Cup contender and have gone back to the future, dumping the 15-man game that helped them beat the All Blacks last year in one of the greatest games of all time and reverting to physicality ahead of skill.
"They are sound in the set-pieces, the line-out especially, but South Africa's outside backs are largely unemployed. The forwards truck it up, mainly one out from the breakdown, and, with their body height poor, the result is invariably slow, unusable ball. In defence, their tight five appears to be slow and disorganised."
Despite that Henry believes it won't be a walkover for the All Blacks and that whichever side handles the unexpected with advance to the final against either Australia or Argentina.
"It should be the All Blacks all the way, but there is a massive rugby history over the last hundred years between these two great rugby nations. South Africa have the second-most experienced team in the tournament after the All Blacks, they have a potent loose forward trio in Schalk Burger, Francois Louw and Duane Vermeulen, a young but talented midfield and proven finishers in the back three. And they have Fourie du Preez at scrum-half, a general supreme. They will be very difficult to beat," Henry added.
"Historically, World Cup semi-finals are close and often the winners are the teams that best handle the unexpected; a card or two, an injury prior to or during the game to a key player or players and maybe - maybe - questionable decisions by the officials. The teams that best deal with the pressure and best react to something not in the script will be the ones in next week's final."