Don't think it matters too much, the difference in points between the #1 kicker and #10 kicker in the league is like 10 over the span of the whole year. So to be honest with you it really is no need to worry. I probably would not even carry two kickers during the course of the season. Just pick one up during the bye week. Plus, if your only worry is your kicker that means your pretty safe and don;t need to worry in the first place.