Opens g6 for the knight, allows pinning an undefended officer at e5, clears the route to the black king, keeps up the pressure so black can't bring its material edge to play.
16... Bd6xe5 17. Rd1e1 Qf7c7 18. Qg3g6 Ke8f8
Qf7 loses at least a rook after Rd8+ Ke7 Qxf7+. Kd8 leads to Ne6+ and Ke7/Kd7 to Qxg7+ with imminent checkmate.