Unless Hayden beats McClain, the entire Cowboys defensive line is going to be different than the one that started opening day 2013.
How can you possibly predict anything?
OL ++ (Obvious improvement in talent and development)
QB - (age/injury > experience)
WR's + (Williams, Harris, and even Beasley develop, progress stopper in Austin gone)
RB's = (Dunbar and Murray remain ?'s and Randle won't develop)
TE's = (Escobar and Hannah develop, Witten ages)
DT's = (Melton/Hatcher is a wash based on age and ijury)
DE's ++ (Lawrence, Crawford, Mincey, Selvie, Spencer > Injured Ware, Selvie )
LB's = (Wilber, Hitchens develop, Carter?, Lee?)
S: + (Wilcox, Church, maybe even Johnson develop)
CB's: = (Claiborne could make the unit great with improvement or weak with another year like last year)
Asides from Romo's rehab, hard to find where this team got worse. There's also a strong chance Romo remains the same if his back actually improves from last year.
Matchups wise Washington became a much tougher opponent while the Eagles got weaker. Giants have big problems all over the place.