Duke's resume is thin its best wins are Michigan, Virginia, @Pitt, UCLA-N, NC State. If they beat Syracuse, North Carolina x2, Maryland that would move them up to 2 line. They need to win out to even be considered as a 1 seed. 1 more loss in the regular season and they are going to be a 2 seed. If Duke had beat one of Kansas or Arizona this race would really close. However, they didn't and their regular season schedule isn't tougher than Syracuse's.and 3 of those losses are to 1-2-3 in RPI and none of them at home
Duke home/homes Wake Forest, Syracuse, North Carolina, Georgia Tech.
Syracuse home/homes Miami, Boston College, Duke, Pitt
That is pretty equal. UNC=Pitt, Wake=Miami, Boston College=Georgia Tech.
Syracuse road ACC games
Virginia Tech
Wake Forest
Miami
Boston College
Pittsburgh
Duke
Maryland
Virginia
Florida State
Duke road ACC games
Notre Dame
Clemson
Miami
Pittsburgh
Syracuse
Boston College
North Carolina
Georgia Tech
Wake Forest
So its Virginia Tech, Maryland, Virginia, Florida State vs. Notre Dame, Clemson, North Carolina, Georgia Tech.
Since Maryland, Virginia, Florida State are 3 of the upper half of the conference versus Clemson and North Carolina. Syracuse in the eyes of the committee will likely have the perception of a tougher ACC schedule and this is assuming Duke ends up 15-3 to make the ACC Tournament worth anything. As Duke's non-conference schedule is going to be perceived as inferior to Syracuse's as well since the only good wins are against Michigan, Alabama, UCLA while Syracuse will have Villanova, California, Minnesota, Baylor, @St. John's, and Indiana on its plate.
Duke's losses to Notre Dame and Clemson are why they have no chance at a 1 seed barring them winning out.