First and foremost, teams don't generally use draft picks before the sixth round on kickers ... and when they do, they usually keep those guys on the roster.
The five kickers drafted by the Dolphins before today were Pete Stoyanovich, Fuad Reveiz, Uwe von Schamann, Joe Danelo and Karl Kremser. Of the five, Danelo is the only one who never kicked for the Dolphins, but he was taken in the 10th round, not the fifth.
Sturgis was the first kicker taken this year, which obviously tells you something about his ability.
But Carpenter has ability, too, which might make some wonder why the Dolphins would look to replace him.
The most logical reason is the $2.68 million price tag that Carpenter carries for 2013. It's a pretty hefty price for a kicker.
Carpenter also struggled early last season when he missed four of his first 10 attempts, although all were from long range. The problem was that two of the misses came in the overtime loss against the Jets.
In addition, Carpenter is not great on kickoffs, even though he has improved in recent years.
Combine those factors, and it was expected that Carpenter would face competition this summer. But now that the Dolphins have used a fifth-round pick on Sturgis, Carpenter will enter that competition facing really long odds.
In fact, the logic says that the only way Carpenter will be able to keep his job is if Sturgis flops in camp and the preseason.
The Dolphins also brought competition for long-snapper John Denney when they signed Patrick Scales.
In this case, finances aren't as big of a factor. Denney is scheduled to make $860,000 in 2013, while Scales' salary is set for $405,000. Denney, like Carpenter, is entering the last year of his contract. But his place on the roster appears a lot more solid right now.