How the heck are the Eagles favored over the Saints in the Dome? EDIT Saints favored by 2.5

Jaylor Carter has been OK. Nolan Smith has been a non factor. He's best suited as an OLB'er in a 3-4,not a DE in
a 4-3,
I noticed something about Philly's 4-3 last night. While most who run a 4-3 use 2 DEs and 2 DTs, the Eagles had 3 DTs and 1 DE