Setup:
1.) Show Blitz
2.) Blitz down LDE (Left Of Screen)
3.) Nickel Corner on the Left of screen make him blitz (Better if he is fastest DB) and place him next to the LDE but put him offsides by an Inch and the switch to a new player on the field and the computer will manually put the Nickel Corner onsides and will have the greatest jump on the snap and sack the QB...
If any confusion please post and I'll try to post a video as well...