BK had very impressive numbers in HS. Even if every snap and every hold are perfect, 62/64 in PATs and 80% FGs with a long of 56 is outstanding for a HS player. You can't get numbers like that in HS being an average kicker.
If a kicker does not use a tee in HS to kick FGs, he is putting his desire to prove things to colleges ahead of his team, which in my opinion is an issue. Discussing tees and HS before, one of the former GT athletes pointed out that HS fields are not as uniformly cut and maintained as NCAA fields. Tees in HS make since for multiple reasons that aren't all about the abilities of the kicker.
I haven't seen JB kick in person, but 33% FGs senior year and 40% FGs sophmore to senior year is not impressive. Seems to me that if he was as great as the ratings sites made him out to be that a HS coach would find somebody/anybody to snap and hold for him. He also did not beat out a less than mediocre kicker at Alabama this year. I'm not trying to put him down, hopefully for him he will prove the ranking guys correct in the next few years. I just haven't seen any evidence myself that would indicate he is better than BK.