Drop all of your Def's and Kickers. Use the waiver wire spot to pick up Harrison or Foster. Then grab Foster, Spiller and Caddy. Right before week 1 see how the starting spots and injuries are playing out. Pick up best matchup Defense and best kicker still available. You may need to switch those two a couple times the first few weeks until you find one you are comfortable with playing each week. Those RB's need to be on your roster because all 4 could be breakout candidates. You'll know much more in 3 weeks time which are worth keeping.
Don't do this you have a top 5 kicker, you have Minnesota's kicker, you will be comfortable starting Longwell every week. What Bob says isn't bad if you don't have a top kicker, but you have one of the best.