Then the problem isn't Shanahan's system. Frankly, if the only system Griffin can thrive in is the spread, he's just another Colt Brennan.
I see what you're saying but I think you're missing my clowning on crapihan and his Mythical System®. I don't think RGIII is going to thrive in that kind of system (under center > 50% of the time) so it looks like we're on the same page.