Blocking an Opponent

I have a dispensable roster spot and my Opponent (The #1 scoring team) is in dire need of a QB. I don’t need a QB (I have Rushelll Wilsssson). On the waiver wire are:

Tyrod Taylor
Case Keenam
Jacoby Brisket

1.) Would you make the move to block him from getting one of these guys?

2.) If so, Which would you choose. (I am leaning Tyrod).