Heck, you'll see teams resting players and still win with their backups, so I wouldn't say they are throwing the game by any means.
Coaches have to make decisions like that all the time. Do I rush my injured star back to win this game, or save him for the playoffs/NCAA tourney. That's why they make the big bucks and have their job on the line if they make what is perceived to be the wrong call.
For example. This year, if Frank Mason twists an ankle in an opening round win against TCU, would Bill Self be smart to play him less against ISU in the second round? They've likely got a 1 seed regardless. So I could definitely see Bill doing that and hoping to have Mason at 100% in the NCAAs.