Stat comparison from both Philly games last year:
1st game Cousins:
Washington Redskins vs. Philadelphia Eagles - Box Score - September 21, 2014 - ESPN
2nd Game Griffin:
Philadelphia Eagles vs. Washington Redskins - Box Score - December 20, 2014 - ESPN
Cousins -------------------------------Griffin
30/48----------------------------------16/23 Completions/ Attempts
427 Passing yards --------------------220 Passing yards
3 TD------------------------------------0 TD
1 INT-----------------------------------1 INT
0 QB HITS -----------------------------7 QB HITS
0 Sacks---------------------------------2 Sacks
Redskins Team rushing:
23/84 Attempts/Yards-----------------29/100 Attempts/Yards
3.0 yard average-----------------------3.4 yard average
Griffin edged Cousins in the only stat that mattered, the final score.
I love Cousins' stat line from the first game, but I love the outcome from the second game more. The defense did play a role in the outcome of both games.
Despite the numbers, JG didn't have enough confidence in Cousins to put him in at the end of the season.
If Griffin is truly our starter going into 2015, then our most pressing need is a reliable 2nd string QB that can come in when the next catastrophic injury happens.