In Act II of Julius Caesar, what does Cassius mean when he says, "Mark Antony, so well beloved of Caesar, should outlive Caesar. We shall find of him a shrewd contriver."?

After Caesar is killed, Antony should appoint the new ruler of Rome.
Antony is a good candidate to rule Rome when Caesar is gone.
Antony should be the leader of the plot to overthrow and kill Caesar.
Even if they kill Caesar, Antony will be just as difficult to control.