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How badly would Kaepernick miss Davis?

If Vernon Davis is unable to play in the San Francisco 49ers’ NFC West divisional matchup at the Arizona Cardinals on Sunday due to injuries to his left knee and ankle, quarterback Colin Kaepernick will have not only lost his security blanket at tight end, but his primary scoring threat.

Consider this: Since the start of last season, only three different 49ers receivers have caught a touchdown pass from Kaepernick -- Davis (15 TDs on 91 targets), Anquan Boldin (7 on 142 targets) and Michael Crabtree (2 on 44 targets), per ESPN Stats & Info.

And in that same time frame, every other team in the 32-team NFL has had at least six different players with a TD catch.

Earlier in the week, coach Jim Harbaugh said he thought the 49ers “dodged a bullet” with Davis’ injury, which occurred when he was rolled up on by Chicago Bears linebacker Jon Bostic after being tackled on an 8-yard reception with about 10 minutes to play in the 49ers’ 28-20 loss on Sunday night.

But Davis has not practiced this week and was limping badly around the locker room on Thursday, days after he needed crutches to get around.

Asked Wednesday if he thought Davis would play this weekend, Kaepernick shrugged.

“I’m not going to talk on another man’s injury,” Kaepernick said.

Then let the stats do the talking, because the last wideout to catch a Kaepernick TD pass other than Boldin or Crabtree was Randy Moss in Week 15 of the 2012 season.

Kaepernick has thrown 177 passes to players other than Davis, Boldin and Crabtree over the past two seasons without connecting for a TD.