Of course it’s part of it, but I don’t think it’s that big of a deal because pass blocking out of the backfield is about experience and will to throw yourself into oncoming blitzers. I think all these guys have the will to do it, they just need the experience to know who’s coming from where. Woodhead had neither the size nor the experience you might expect and he stepped in and did fine.
I think the bigger factors are ball security and knowing which route to run and how to run it to Brady’s liking. If they can do those two things, they should get a chance.