Interesting SI article about Krenzel here: http://sportsillustrated.ca/vault/article/magazine/MAG1029307/2/index.htm
"[His high school coach] took [Krenzel's 4-minute highlight] video to Central Michigan assistant Tom Kearly, who watched one minute and told Copacia, "Coach, he can play for us right now and play four years." Satisfied, Copacia sent the tape to 30 colleges and gave a copy to Brian Krenzel, who showed it to Duke assistant and former NFL guard Joe DeLamielleure. "He was one of the best high school players I'd ever seen," DeLamielleure says. "He was hitting players in the chest, and they were dropping everything. I remember saying, 'He'll go to Texas or Colorado or Michigan or somewhere like that.' " Quoted from the above-linked article.
I always thought the above quote was interesting, and suggests that the offensive scheme in those early Tressel years limited Krenzel's development as a passer. But when the money was on the table - nuff said.