As rec and I discussed before if Purdue gets everyone back I think they are and should be the preseason #1 team in the country.
I think you are dead wrong. Even if Purdue gets everyone back, they still don't have a decent PG, they don't have any depth, and Hummel will not be the Hummel of old. Duke has an NBA quality PG, backcourt depth, and the probable national POY.
This past year, Duke needed a great draw and some good breaks to win the tournament. Next year, they will need a less than favorable draw and some bad breaks to lose the tournament.
Duke's opponent in the Big 10 challenge will get hammered. No team has a better home court advantage than Duke. It is too bad that a Turner versus Singler matchup could not have been realized. But, when a player is a lottery pick, he has an easy choice to make.