Unlike last year when they spent more than 50% of snaps using ZBS with Lacy (switching to more power stuff later in the year) they have probably dipped below 50% of ZBS this year. Lacy runs a lot of interior stuff with pulling Guards and double teams on the nose, Power O type stuff. You will still see some inside zone and a good dose of outside zone, but you may be surprised at what they roll out there.
You can see the effect on the RBs because Starks gets less effective with less zone.