They aren't saying that ND is the best team, but because of the schedule has the best chance of going 12-0. ND's preseason FPI ranking is 7.
Opponent rankings:
Florida State 11
Texas A&M 14 (too high IMO)
Southern Cal 18
Louisville 21
Georgia Tech 54
Stanford 59
Purdue 60
Virginia 72
Miami 90
Northern Illinois 114
Army 121
Navy 124
Opponent rankings:
Florida State 11
Texas A&M 14 (too high IMO)
Southern Cal 18
Louisville 21
Georgia Tech 54
Stanford 59
Purdue 60
Virginia 72
Miami 90
Northern Illinois 114
Army 121
Navy 124