NERD ALERT
Because of Whitelock's longevity you can draw a line through almost the entirety of AB history going x played with y in his debut game y played with z in his debut game etc and only 22 names takes you back to AB#28 from 1893 - Mac McKenzie McKenzie played in the second game the AB's ever contested.
I cheated twice. McKenzie played with a Humphries who wasn't in the team when Dave Gallagher debuted but was back in it two games later.
Similarly the Baby Blacks screws things but if you go with any number who debuted against France in 86 then in the third game they played with Whetton who played with Haden on debut.
There is a break in the chain due to WWII but one guy James Tilyard did play either side of WWI.
You can actually make the chain much shorter by just going played with rather than on debut but the point is as above Whitelock has played in a phenomenally high % of our tests.
We didn't play our 153rd match until 1921 and our 153rd test was against Australia at Eden Park on the 16th September 1972 !!!
We won 38-3 six tries to none. An absolute hiding for those days. I was there.