“One of the weaknesses of Shanahan’s system is it can be predictable where the ball goes against the blitz. In some offenses, the quarterback is in charge of sniffing out pressures and changing the protection. In this system, the quarterbacks have “hot routes” built in on which a receiver will cut their route short against the blitz. This is a good way of keeping things simple for quarterbacks and allows them to play fast, but there are limitations. A smart defensive coordinator can game plan where he thinks an offense’s hot routes are.