The Saints' defense under Rob Ryan is predictable in that there’s only one rule - expect the unexpected. Ryan likes to deploy his players in a wide variety of different looks, with multiple fronts, alignments, personnel groupings, blitzes and coverage schemes. Chip Kelly alluded to that throughout the week, and it’s something the Eagles will have to be ready for on Sunday.
When you look at a lot of defensive schemes, you get a sense of whether or not they prefer one-high or two-high coverages (referring to how many safeties are deep). Every team plays some of both to mix things up, but there’s almost always more of a tendency to go one way or another.