Didn't pick up the playbook and cannot pass block

simple as that.

And that is not exactly a knock on him. Well it kinda is. He needs to pick up that playbook or he is toast, but its very common for RBs to have no idea how to pass pro coming out of college. Coaches in college very rarely emphasize it. So when you find one that can, you have something.

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Don't waste your time looking back, you're not going that way. - Ragnar Lothbrok