Well... Deep South Fire Eaters had threatened to secede in 1856 if any Republican were elected President, so the secession crisis had nothing to do with Lincoln personally, only the fact of being Republican.
Immediately after inauguration in early March 1861 both Lincoln and Secretary of State Seward expected to abandon Fort Sumter, even though President Buchanan had pledged to defend it against attack and never surrender for any reason.
In time both Lincoln and Seward came to see the necessity of defending Fort Sumter and an opportunity to do so in the Doubleday/Fox plan to resupply in small boats at night.
Seward's comment on Lincoln at the time was: "he is the best among us."
So it's not at all clear if or how things might have gone differently had Seward been President.
You don’t have to include me on your list, thanks.
I’m constantly amused how he would realign the sun, the moon, and the planet itself (if he only could) in order to make his fancy come true.
Unfortunately (for him) reality doesn’t conform to his whim.