I honestly think Blaze, even after years of touring with Wolfsbane, was still so green when it came to his voice he didn't know any better at the time that they should have tuned down. He still says to this day he learned so much about his voice from working with Steve.
Having read At the End of the Day a long time ago, I recall him saying something along the lines of the subject of tuning down never coming up during auditions or rehearsals, but I've never read or heard about him blaming Steve for anything. It's always the opposite. If there's an article or a quote in the book I've forgotten that states otherwise, I'd like to see it.