Is it? I've never heard that before.General consensus you need 4 rucks on your list.
As it sits we have TDK/Pitto/HOK and Jsos as pinch hit.
On iPhone using BigFooty.com mobile app
3 to me, in the modern game, is plenty. 1 starter, 1 backup and 1 developing.
I think the game has shown that playing 2 rucks just doesn't work these days, so having 4 on a list is excessive imo.