After the 1995 triumph of winning the World Cup, Waterston dropped out of the Springbok limelight as Christie's health deteriorated and new coaches like Andre Markgraaf, Carel du Plessis and now Nick Mallett followed.
But now Waterston is back for the fourth World Cup working under the red colours of Tonga.
His involvement came as Tonga searched for guidance after losing three consecutive tests in the Pacific qualifying tournament last year. The search stopped in South Africa, where Dr Ignatius Pretorius and Sebastian Hatting were recruited as coaches and Waterston as the technical adviser.
The losing run stopped and Tonga this week became the last qualifiers and the All Blacks' first opponents in their pool for the October start to the World Cup.
All Black selector Gordon Hunter remembers Waterston from their days in Dunedin.
"He is a very passionate man about his rugby and he has a bent for the technical, statistical side of it," recalled Hunter.
"He went to South Africa and then the next I knew of him I was coaching Otago in the Super 10 against Transvaal, who were using Dave's video analysis to break down all my plays.
"They knew more about me, my team and the way we played than I did and that was scary. That was the first time I was exposed to this sort of video analysis and now we use it a lot with the All Blacks."
Tonga had a troubled tour of New Zealand last year but carry some familiar names for this year's World Cup. Former captain, Manawatu and North Harbour forward Mana Otai is back, so too first five-eighths Elisi Vunipola, former Wallaby loose forward Fili Finau and former soccer international and occasional Auckland wing Taunaholo Taufahema.
Tonga will also be courting players who qualify and are playing in Japan, the British Isles, Australia or New Zealand, where a few players who miss All Black or New Zealand A selection may then become available for the Pacific Islands republic.