When it comes to QBs, I don't think any numbers can really tell the story. Aside from Wilson's offense (which does a great deal to allow him to be successful), the defense and ST consistently getting the offense good field position and/or short fields makes a huge difference.
Seattle's home field advantage is the best I've ever seen - in any sport.
These are the factors that IMO make RW so successful:
The offense - most lethal play action game in the NFL, off of the most lethal running game in the NFL. Wilson deserves credit for his part in the read option.
The defense/ST - I don't understand why this isn't talked about more often. The Rams have an explosive (at times) defense and special teams - but the defense hasn't even been CLOSE to the Seahawks defense - I've witnessed us win multiple games in blow out fashion over the past two years that would have required almost no input from the offense. Seattle is an even better example of this. (i.e. the superbowl win, where the D/ST outscored Denver 14-8).
The WRs - while I'm sure they drop some passes, I have seen more spectacular catches from Seattle WRs over the past two years than any other team. Wilson throws a good deep ball, but a lot of them are jump balls that a WR makes an amazing play on (i.e. the catch in the superbowl that put them in position to win).
The fans - I'm sorry, but even with a backup QB the Seahawks would win 6-8 home games per year. The primetime game against New Orleans two years ago is a good example of this - that team was outmatched and even with a punter at QB the Seahawks would have won that game.
So now your Pete Carrol - you know all this, because these are facts. Also, as the coach, you can see what is holding your offense back (OL and WRs like the fans think, or is it in fact Wilson).
The eye ball test tells me Wilson should get Alex Smith money, unless he will be able to average 800 yards rushing and 10 rushing TDs per season.