Week Nine power rankings

1.  Packers (No. 1; 8-0):  Halfway to an undefeated season, the Packers’ defense is suddenly alarmingly porous. 2.  49ers (No. 2; 7-1):  The Niners have a better formula than the Packers to win games in January. 3.  Giants (No. 6; 6-2):  The good news for the Giants is that quarterback Eli Manning truly has become…