If the same person appear’s in two different whakapapa with two different generation dates. It is because the two sources differ and work is needed to find a solution to the problem involved. For example, Hoturoa in the Tainui whakapapa is 1275, but Hoturoa in the Hauraki whakapapa is 1325. This is a common type of problem illustrating the need for more research to be done as we are trying to get the best listings rather than accept differences.
— Graham Smith