YOU MUST RUSH AT LEAST 3 PEOPLE ON YOUR DEFENSIVE LINE ON EVERY PLAY. i don't care if you run a 4-3 and audible one of the ends or DT's into coverage, but if you're playing a 3-4 or a 3-5-5 or a 3-2-6 or whatever formation, 3 people on your defensive line need to be rushing the QB.
Neogaf madden league member: Ok what if i have a 3 man line and i want to use one of them as a spy!
FMT: 3 people on your defensive line must rush the QB.
Neogaf madden league member: Ok so what's the answer?
FMT: In that scenario, are there 3 people going after the QB?
Neogaf madden league member: Well... no i guess not as such.... one is just sitting there waiting.
FMT: 3 defensive linemen need to be rushing the QB on every down. so in your scenario, that would be illegal. if you want to rush 3 defensive lineman and spy with a linebacker or CB then go wild! but on every play, 3 defensive lineman need to be rushing the QB.
because we don't have video proof (well, most of us) it isn't always easy to prove but dont be a fucking douchebag about it. it's simple: if you pick a play with only 3 defensive lineman on the line, don't audible those lineman into coverage! shift them left, right, pinch or whatever but dont audible them into coverage. easy!
THE EXCEPTION TO THIS RULE IS IF THE GAME HAS DESIGNED A PLAY IN THIS MANNER YOU CAN USE IT. VELCRO 9 AND A FEW OTHERS. BUT DON'T MANUALLY MAKE A PLAY LESS THAN 3 DEFENSIVE LINEMAN PASS RUSHERS