I'm in a 12 team league where we start only 1 DB. I currently have Branch vs @NYG, but I saw that he got injured during last weeks game. If it turns out that Branch won't play, who from my WW should I pick up?

Piscitelli vs @PHI
Delmas vs PIT
A Rolle vs HOU
Elam vs @BUF
Clements vs ATL
Dawkins vs NE
T Newman vs @KC
R Nelson vs @SEA
K Rhodes vs @MIA
M Brown vs DAL

Here's my leagues scoring system:

1.5 point per solo tackle
0.5 points per assist
3 per sack
3 per INT
2 per Forced Fumble
2 per fumble recovery
6 per Defensive TD
4 per safety
1 per pass defended

Piscitelli, Elam or Dawkins should be your pick this week. Given your league's scoring, I'd probably go with Dawkins.