I think defenses need to get about a year of film on him and then they'll figure out how to defend against him, ala Cam Newton.
To me, the key is stop allowing RG3 to freeze the defense. Have the DE's get backside responsibility to protect against Morris' cutbacks and RG3 rolling out. The rest of the front seven needs to stop worrying if RG3 will run. If he does, sooner or later he will take too many big hits and that will prevent him from wanting to run again. Or it will get him knocked out of the game like it did against Atlanta.
Kyle Shanahan clearly protected RG3 in the Giants game by having him throw it very little and instead using Morris. I think if a team can stop Morris and take away the WR screens, he'll struggle like rookie QB's will struggle.
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