Playbooks

Mesh out of I Form Close (21 personnel) sends both X and the inline TE on crossing routes that sit down at the same shallow depth, creating a natural rub for man coverage while the FB releases underneath to the sideline as a shallow checkdown. The Y off the mesh runs a corner route up the seam, and the backside slot pushes vertical up the sideline as the deep clearout. This is a classic man beater built on traffic at the mesh point, with the primary read going crosser to crosser first, then to the FB flare, and finally up to the corner or deep vertical if the mesh occupies the defense long enough.
Man coverage defenders who trail through the mesh point without switching assignments will get picked, so look for any hesitation or collision at the rub to identify your open crosser. Cover 3 and Cover 4 zone shells with linebackers sinking into the shallow zone can clog the mesh, so key the middle linebacker depth before the snap to see if he is sitting on the crossing routes. Watch for a user controlled defender lurking in the shallow zone trying to jump the mesh crossers, since that is the primary counter to this concept and forces you to the FB flare or corner route instead. Blitz packages that send extra rushers off the edge are answered by the FB release, so if you see linebackers crashing downhill or safeties creeping into the box, get the ball out quickly to the flare. Against Cover 2, the corner route up the seam has a window between the flat defender and deep half safety, so read the corner's depth to know if that throw is available after the mesh clears out underneath defenders.
Pre-snap, check if the defense is showing man coverage with corners lined up tight or bracketed inside, since the mesh crossers thrive against man leverage and defenders trailing through traffic. If you see zone drops with linebackers sitting in the shallow area, hot route one of the crossers into a shallow drag past the mesh point or convert to a spot route to avoid the mesh getting jumped. Use the FB flare as your outlet against blitz looks, since the extra blocker release gives you a quick answer versus pressure. This play works best on second and medium to third and short where the shallow crossers can pick up the sticks quickly after the rub. Pair this with PA Spider Mesh or PA Boot Flow from the same set so the defense has to respect both the standard mesh concept and the play-action version, keeping linebackers honest on their run fits.