John Calvin taught that Jesus died ONLY for the Predestined ie. Those selected by God before the creation of the world.
The greatest OT Prophecy of Jesus Christ's coming and suffering is found in Isaiah 53. From this highly revered OT scripture passage concerning the Messiah's coming, it is clear that the Messiah would be dying for ALL people not just some, most, or few.
"All we like sheep have gone astray; We have turned, every one, to his own way; And the Lord has laid on Him the iniquity of us ALL." Isaiah 53:6
This is why I believe that "whosoever" is eligible for Salvation! - John 3:16