In regards to injuries, mull this over

[Pudgepork]

On a sports talk show this morning, they were talking about
a teams starters at tailback and qb and how important it is
for them to play all season.   They pulled up this stat:
In college football, the percentage of starters who play every
game is 34%.   That stresses how important quality depth
at every position factors into a run at championships

[Boarmonger]

Luck factoris a great deal into winning a championship as well.  I don't disagree with your point, I just wonder how many of those champions had their RB and QB fall into that 34%. 

[DeltaBoy]

Luck timing and health are all important.