Russell Wilson's touchdown percentage has decreased while his interception and sack percentages have increased. Maddie Meyer/Getty The Seattle Seahawks fell to 4-5 on the season in a huge loss to the Arizona Cardinals, their division rivals, on Sunday.

While the Seahawks nearly mounted a second-half comeback thanks to their defense waking up, of more concern in the 39-32 loss was that Russell Wilson had his worst game of the season in one of his most important games of the year.

Wilson was just 14-of-32 passing, a 44% completion percentage, for 240 yards, one touchdown, one interception, and a 67.2 passer rating.

The Seahawks now trail the Cardinals by three games and are two games behind the Wild Card leaders. If the playoffs started tomorrow, the Seahawks would be on vacation.

While Seattle has plenty of concerns, Wilson's regression this season is alarming. Wilson is on pace for a career high in passing yards, and his completion percentage is up, but his numbers have fallen in plenty of other places. His touchdown percentage is 3.8%, down from 4.4% last year. His yards per completion are down slightly, his passer rating and QB rating are down, while his interception and sack percentages are up considerably.

The Seahawks' offensive line has been a huge problem this season, but Wilson hasn't helped much. According to Football Outsiders, heading into Week 10, Seattle's offensive line was last in pass protection, allowing an adjusted sack rate of 11.2%. Yet, as noted during the Seahawks-Cardinals game, Wilson has been to blame for many of them:

—SNF on NBC (@SNFonNBC) November 16, 2015

As CBS' Ryan Wilson points out, Wilson hasn't made improvements as a pocket passer. Last year, Wilson took steps in becoming an improved pocket passer, making his signature scrambles all the more deadly. This year, he hasn't built upon his pocket passing as many people expected.

As ESPN 710 Seattle's Danny O'Neil argues, it's fair to wonder whether Wilson has hit his ceiling already. That's not to say he definitively has or that he won't get better, but O'Neil reports that before the draft, teams wondered whether Wilson would develop quicker than expected and then stall out. This season, it's looking as if those scouting reports may have been accurate.

Perhaps most surprising, Wilson is struggling in a season in which the Seahawks made moves to make his life easier. After a long delay, Wilson was awarded a huge contract extension, answering questions about what his future with Seattle held. The Seahawks also improved the team around him, making a blockbuster trade for Jimmy Graham to give Wilson his most formidable target yet.

Through nine games, the Graham acquisition has been uninspiring. He has had a couple of big games but many others in which he has been quiet, including his three-catch, 41-yard outing against the Cardinals. The Seahawks are using Graham as a blocker more and having him run different routes, but it's surprising that Graham and Wilson haven't developed better chemistry (his three catches came on eight targets in Week 10).

While the Seahawks still have seven weeks to turn it around, they are facing an uphill battle. They are tied in the NFC West with the 4-5 Rams. Seattle still has to play the Steelers, the Vikings, the Rams, and the Cardinals over the next seven games.

Even if any of the NFC playoff teams slip up in the next few weeks, Seattle has a tough remaining schedule, with three NFC playoff opponents on the slate. A loss to the 7-2 Vikings or the Rams or the Cardinals could essentially end their season.

If the Seahawks plan to make a run, they will need Wilson to return to form.