Great topic.
On one had, you'd think there are many capable players to play on special teams. They've made it to this level for a reason............they are very talented.
On the other hand, if you are a multi-million dollar coach at a university that expects wins and a national championship, I may be tempted to put my best athlete on the team in a position to make plays on special teams.
I can see both sides of the coin on this one. Personally, I'm giving my second string players an opportunity to get on the field and showcase their skills. That experience in front of thousands of fans is invaluable. Not to mention, your best player on the team doesn't do you any good with an ACL tear that happened on special teams.