Drop/Pickup LB questions

Based on your waiver wire recommendation, I picked up Justin March and Todd Davis. Reckless owner in my league dropped T Whitehead and M Barron. While March and Davis played well last week and become potential everydown back in the near future, Whitehead and Barron are currently everydown LBs. I have a strong feeling that Justin March will become stud and replace D Johnson sooner than later. Is it worth to drop Todd Davis to pick up Whitehead or Barron?

Mark Barron, if he has S eligibility ...STUD

I would definitely look into get whitehead. He had a great week 1 and with Levy having a bad week 1, I see Whitehead continuing his dominance.