X-WR Outside/boundary receiver. Perimeter wins, verticals, contested space, physical coverage.
Z-WR Movable receiving answer. Can be schemed around, moved, protected, and fed volume.
Y-WR Slot/inside receiver. Leverage, option routes, traffic work, middle-field reliability.
KR/PR Kick return / punt return value. Roster utility and field-flipping ability.
3D-RB Three-down back. Run, catch, protect, and stay on the field without tipping the play.
3DRB / 3RDB Third-down back. Passing-down trust, protection, receiving, spacing, QB confidence.
XPL-RB Explosive back. Burst, long speed, big-play creation, creases into damage.
PWR-RB Power back. Contact balance, short yardage, finish, physical reliability.
YS-TE Y-slot tight end. Receiving TE, detached target, seam/middle-field mismatch.
SW-TE Swing tight end. Movable TE who can block, catch, align attached/detached, and keep the offense flexible.
BL-TE Blocking tight end. Attached force player, edge setter, sixth-lineman function.
HB / FB Backfield connector roles. Motion, insert work, lead blocks, leaks, short-yardage structure, special teams.