when they want to run, they can, they use a FB maybe 1/3 of the time...Bill Walsh wrote about the improtance of a fullback who can block and catch. All offense steal from others, I've posted lots of times that all offenses are hybrids, but compared to McVay, Shanny's is more true to the Walsh offense, but in this era, he's taken things from other offenses, getting deep, etc...