This is why you see draft day trades. If they have a guy that is rated high enough at a position of need they will go up and get him. They will move down if they think the value isnt there and pick up more ammo possibly to take a shot at a high risk high reward guy with the extra picks. You definitely are correct though If they have a need in front of them with a sufficient grade they will take him. You cant draft the same position every year.
If a better option is obtainable, but you could do much worse.