Depth in the secondary. That's arguably the biggest strength the Irish have entering the 2007 season.
Coaches have said the competition and level of play among the defensive backs is very high.
Now, a sophomore, Darrin Walls has moved ahead of senior Ambrose Wooden on the depth chart.
Its a sign of that depth and competition.
"It wasn't anything Ambrose was not doing," defensive backs coach Bill Lewis explains.
Lewis says in all his years of coaching he has never moved a player down on the depth chart, but instead moves a player up.
"It was what Darrin was doing a lit bit better," Lewis continued.
"Ambrose understands that. Ambrose has a huge role in this game on Saturday."
Lewis said Wooden is the ultimate team player, taking the news in stride.
Wooden, who started in 2005 but not last season, just wants to do what's best for the team.
""It's not about one individual or two individuals. Its about 100 guys on this team," Wooden says.
"They're going to make a decision to put the best players on the field to help this team win. I'm not upset about anything. I'm just going to go out there and play."
Walls, who had a nagging shoulder injury throughout the 2006 season, credits the seniors for getting him to this point.
"Ambrose and Terrail, our veteran corners on the team, they helped me a lot," Walls says.
" We go out there and practice and compete against each other. Competition only makes you better and they were a big part of that."