Duncan will be difficult to replace. At his peak, very similar to Pops Kelly who often went unnoticed (to many outsiders) but was very much a barometer of the team.
Shame, because I always thought Duncan would be one of those players who would not hit the wall quickly. Could see him playing at a high level into his mid 30's but he's been cooked for the best part of 18 months now.
One of my all time faves. Agreed