Noah Burnette may very well be having a time where he needs to iron things out a bit.
All kickers go through spells where they have to make mechanical corrections.
He's had a very good kicking record during his time at UNC, which tells me that he (and Coach Biagi) should be able to fix things.
That being said, I'm not sure about Zac Yoakam, but Erik Schmidt isn't chopped liver. He was the #2 or #3 high school senior kicker in all of the nation last year.
If Burnette can't hammer out the dings in his mechanics by the time fall camp rolls around, then we simply go for the youth movement.