Time travel? The fall 1865 elections returned many confederates and Southerners to political office - including former Whigs and Unionists - even Alexander Stephens was elected to the Senate. Those men PASSED the 13th ending slavery.
The "Southern" states that reatified were either pro-Union rump legislatures such as the Virginia Legislature (located in Alexandria) or provisional governments appointed by the President.
As you can see, four of the Confederate states ratified even before the war ended and there were no 'former confederates' involved in those governments.
The dates of ratification were: Illinois, February 1, 1865; Rhode Island, February 2, 1865; Michigan, February 2, 1865; Maryland, February 3, 1865; New York, February 3, 1865; Pennsylvania, February 3, 1865; West Virginia, February 3, 1865; Missouri, February 6, 1865; Maine, February 7, 1865; Kansas, February 7, 1865; Massachusetts, February 7, 1865; Virginia, February 9, 1865; Ohio, February 10, 1865; Indiana, February 13, 1865; Nevada, February 16, 1865; Louisiana, February 17, 1865; Minnesota, February 23, 1865; Wisconsin, February 24, 1865; Vermont, March 9, 1865; Tennessee, April 7, 1865; Arkansas, April 14, 1865; Connecticut, May 4, 1865; New Hampshire, July 1, 1865; South Carolina, November 13, 1865; Alabama, December 2, 1865; North Carolina, December 4, 1865; Georgia, December 6, 1865.
With former Confederate states part of the ratification process, Virginia and Louisiana approved the Thirteenth Amendment in February followed by Tennessee and Arkansas in April. The governments of Louisiana, Tennessee, and Arkansas were those established under President Lincoln’s Reconstruction policy. In Virginia, the Thirteenth Amendment was ratified by a “rump” legislature, which had begun meeting in Alexandria shortly after the Civil War began, claiming to be the legitimate and loyal representative of the state in the Union. It had earlier approved the creation of the state’s western counties into the new state of West Virginia. The U.S. State Department accepted the ratification from those four and, later, other Southern states.
In the months following the end of the Civil War and President Lincoln’s assassination in mid-April 1865, the Thirteenth Amendment was ratified by Connecticut on May 4 and New Hampshire on July 1. The focus then shifted southward as momentum for ratification slowed. Upon the death of Lincoln, Vice President Andrew Johnson, a War Democrat from Tennessee, was sworn in as president. While Congress was in recess during the summer of 1865, President Johnson began implementing his own Reconstruction program.
Under his guidelines, the new state constitutions abolished slavery, repealed their secession ordinances, and repudiated Confederate war debts. The president also urged, but did not require, the former Confederate states to ratify the Thirteenth Amendment as a condition for regaining representation in Congress.
Source: http://13thamendment.harpweek.com/HubPages/CommentaryPage.asp?Commentary=05Results