Go back and look and you'll see that Detmer was quite prolific at creating interceptions during his career at BYU. He was not on a tight leash and was allowed to play through his mistakes. In the NFL that didn't change much at times too. After he does hold a near unbreakable record in the NFL too.
I wonder if that is Detmer's kryptonite. He might let Taysom go out and throw interceptions until the sun goes down because that is what he did too.