Because God may intend someone to be saved as a result of another's action.
I was saved as a result of hearing the Word of God. The Holy Spirit gifted me with faith as a result of someone preaching it.
God led both one to preach and another to be saved.
So if one didn't do as God said the other wouldn't ever be saved? Not according to point 4, the elect will be saved no matter what. In fact, if you truly believe point 4, an “elect” can refuse.