[central_va]

Lincoln could have sent negotiators to decide how much of the standing navy, army, western lands, etc. rightfully was due to be turned over to the South

He didn't have to, it is historical fact that the South sent a peace delegation to DC that Lincoln totally ignored.

[Ditto]

... it is historical fact that the South sent a peace delegation to DC that Lincoln totally ignored.

No, the "South" did not send a delegation. An illegitimate entity called the Confederate States of America sent a delegation. Lincoln, rightly, did not recognize that entity and refused to recognize them as legitimate.