I good tape to watch is the Colts game at Arrowhead from last season. Some things that will drive the success of the Ravens 4 man rush. I suspect it will come down to the following:
1. The success of McPhee or Judon to crash into the pocket and force Mahomes to step out and not be able to plant to make every throw in the book. Whether he is clean in the pocket or dropping back, he gets clean feet to either step in hard or step in lightly to the throw with his back step jump. When he goes on the side, arm angle drops and loft is not possible on his throws unless he air mails it with too much loft.
2. The ability for the stunt packages to loop either Campbell or Wolfe, plus the ability to creep blitz by off the edge or loop the middle linebacker in the 3 gap left behind the crashing defensive end, or both.
The linebackers covering is the absolute key to the defense when they get him outside the pocket. Andy Reid is going to try and isolate Fort and Queen hat on hat to get someone open in an option route, but you don't get option routes when you break him outside the pocket.
Secondary - They run deep over, banana, or fly...there isn't much variation but to stick to the hip, don't get sucked in underneath and stay hat on hat. Its about baiting the linebacker and safety to suck in, but stay honest to the coverage and stick to the hip.