Dropping a player to pick up Martavis Bryant

Thinking about dropping ty Montgomery to pick up Bryant for a stash. One of the top teams have Bell, fournette, Jones, Mack and Rawls as other backs wideout kind of light with Allen, Anderson, Adams and Richardson. Worried might go off and won’t be able to get or can wait till next week and drop Richardson or Rawls to snag him up. Right now he’s simply a speculative stash potential