Yes and yes in theory. You bracket your needs based on availability. If you have a 90 at S, DB, LB and DL, it's not as easy as saying we need DL the most so we are going there. If you think you can get suitable DL later, although it's the greatest need, you maximize by drafting what you think won't be there later. That's why they have runs on positions. Actually like in the mid rounds of a fantasy football draft.