@Josho
I watched some of last week's match between the lions and the tigers...
I wasn't impressed by Brisbane. They don't look like a premiership team
Yeah that was a terrible game, this week they played a poor first half against the Suns, but did a marvelous job in the 2nd half turning the margin around by 78 points to win by 49 points.
Depth is the Lions problem, they get a few key players injured, but don't have the same level of skill from the reserves to back it up, and the team pretty much collapsed against the Saints and Tiges. If they had won both games they would be 2nd on the ladder right now, but are now risking finishing outside the top 4, they cannot afford to slip up another game, and are relying on Port to lose one to make the top 4.
Teams like Geelong though have plenty of depth and players get unlucky to miss out on first team.