Playbooks
Wing Flex is the 12 personnel wrinkle in Singleback that trades a true slot receiver for a wing tight end tucked just off the line, giving you a compressed strong side with a flexed second tight end pushed out toward the numbers. Unlike Singleback sets that spread three or four receivers across the field, Wing Flex keeps the formation tight enough to sell downhill run action while still creating a two-man surface on the wing side that linebackers and safeties have to declare against pre-snap. That declaration is the whole point: you get a run-heavy shell with a legitimate vertical threat isolated outside, and the Gadget tag on this set means you also get misdirection and boot concepts that punish defenses for over-rotating to the wing.
Establish the run first with 0 1 Trap and HB Toss Strong on early downs, then run PA Boot Screen and PA Fl Dive off the same read to punish linebackers who start flowing hard
Read the safety alignment before calling Slot Fade Shot: one high with the corner pressed to the wing side means take the shot, two high means check to Quick Slant or a run
Motion the flexed player across the formation pre-snap to diagnose man versus zone, then hot route the wing tight end to a flat if a defender follows him
Counter Weak and HB Zone Wk are your answers when the defense over-shades to the wing, so watch the linebacker depth and gap alignment before the snap
On third and five to eight, use PA Y-Cross with the running back hot routed to block so you have six protecting and can let the crosser develop against zone