Naw, neither Lincoln nor any other Northern leader (i.e., President Buchanan) agreed that secession "at pleasure" was legitimate.
All agreed that secession alone was not rebellion.
But even former President Buchanan did agree that Davis' assault on Fort Sumter was rebellion and must be defended against.
So it was Fire Eaters and Davis who played the role of your Darth Vader, altering the terms Constitutional compact.
“When in the Course of human events, it becomes necessary ...to institute new Government, laying its foundation on such principles, and organizing its powers in such form, as to them shall seem most likely to effect their Safety and Happiness…”
This is from the DOI; not the U.S. Constitution.
Start with that.