Why would you hire Norv? He runs the same offense we do. Norv's is more like Coryell's because he has Gates who is more like Kellen than Witten. His WRs are a bit bigger but both still run big WRs. RBs about the same. QBs about the same in general. Norv has more experience but what is his W-L record? There's just not much difference.
If you change coaches you basically should be thinking about changing your offense.
Did you know there are only 5000 Snow Leopards in the wild now and they are confined to Central Asia? However, the effective global population (those likely to reproduce) is less than half that number.