WR issues

I know this is the IDP forum, but I need some Guru help  :-)

I have room for 2 backup WRs on my team. (My starters are Bowe and Cobb!)
Currently I have DeAndre Hopkins and Kenbrell Thompkins.
Emm. Sanders is on the WW.

I'm trying to gauge high ceiling opportunity with the backups.
Should I drop Hopkins or Thompkins for Sanders?

I'd drop Hopkins over Thompkins.