Depth isn't always utilized, and it isn't always needed. The 2012 national champions, the Kentucky Wildcats, had a paltry rotation of six, sometimes seven, players. The runner-up Kansas Jayhawks were in the same boat.

With that being said, having eight or more players capable of contributing is hardly a bad thing. An injury to one of the Wildcats' core six would have been devastating. 

Michigan State, on the other hand, was one of the deepest teams in the 2011-12 season. The Spartans still made the Sweet 16 despite losing freshman phenom Branden Dawson late in the year.

Fast forward to the 2012-13 season, and you should not be surprised to see Michigan State in and Kentucky out
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