This sounds right. Shakir is a slot receiver and wouldn't do well on the outside because of his size and leaping ability.
So give Sherfield a shot or even Shorter and see what it looks like. Shorter at 6'4 and 220 running a 4.5 might be exciting to see at the Z. He could be a hungry rookie.
Let Shakir, Harty and Kincaid fight it out in the slot