I watched the PHI vs. CAR replay to see if this is a different Sanchez than what we saw with the Jets. I conclude he is not.
His strengths are good arm strength and mobility, and a decent release. Everybody knows that. Philly also runs a fair amount of read option or zone option, whatever is the terminology flavor of the day. I did not see Sanchez keep it off the option against Carolina, but he's capable of doing so.
Sanchez's key weakness in New York is still evident...slow processing. He tends to stare down his primary receiver, frequently glancing at that guy pre-snap. I don't see any signalling with those glances...it looks like he's pre-visualizing his primary throw. By the time he gets to the second guy in the progression he's deep into the 2.5 second clock. He never gets to the third guy.
So far, Sanchez has benefited from an outstanding pass blocking line...they've surrendered only 12 sacks, 3rd. best in the league, despite having the immobile Foles behind them most of the season. The two Sanchez opponents, HOU and CAR, are around the middle of league in sacks, as are the Packers. HOU and CAR are in the bottom 1/3 of the league in opponent passer rating while the Packers are 5th. in passer rating and 4th. in picks.
At the top of the Packer defense need-to-do list:
1. Hit Sanchez. This falls into the Capers' default position of heavy blitz frequency. Sacks are not important, though they're certainly helpful. The key is to get in his face and knock him around some. A pick or three will follow.
2. Contain Sproles. Quick little multi-tools like Harvin, and Sproles himself in the past, have given the Capers defenses trouble...blitzing opens space for these guys particularly with misdirection.
Item 2., plus the fact Sanchez can run, argues for a reprise of Matthews getting a heavy snap count in the middle to get some sideline-to-sideline speed in the box. He'll need to avoid guessing and over-committing on misdirection...getting suckered in other words.
If the Packers get a 10 point lead early, there is high likelihood Sanchez will fold...a fast start is the first item on the menu; no deferring if the Pack win the toss.