It is hard to get evaluate a new head coach before they coach a real NFL game. But I will have to admit as a Bills fan that this was a great move by the Dolphins. Randy Mueller has a very solid track record in acquiring NFL talent and has a completely different background than Saban. While Saban will have final say it should be very interesting to see which positions Saban trusts Mueller on more. Just a guess but I would think that Saban will be more inclined to listen to other opinions on the offensive side of the ball.
This move was very important because it is next to impossible in today's NFL to be head coach, defensive coordinator, and GM at the same time. Most NFL coaches that take on too much responsibility without delegating grunt work underperform. The hiring of Mueller allows Saban to have more time doing what he should be doing....coaching.