Ziemke Bauer: Moscow to Stalingrad NY 1988 p. 475 on 24 Nov 42 v. Manstein reported to OKH "he could not concur at present with AG B's stand in favour of breakout."
True, on 19 Dec42 he informed Hitler that because LVII PzCorps probably could not achieve contact with 6th A … he believed the only answer was to order the army to break out…That, he maintained, would, at least, save most of the troops and whatever equipment could still be moved…To Paulus he sent advanced notice of breakout order. But the message ended that the army was to get ready but not start until ordered. Hitler , encouraged by LVII PzC recent success, refused to approve. Instead he ordered PzGrD Viking from AG A to 4th PzA and insisted that 6th A was to hold out until firm contact was established and a complete, orderly withdrawal could be accomplished.
Note Hitler was ready to evacuate Stalingrad on 19 Dec but wanted to play "safe" which is often fatal in fluid situation. Typical best is the worst enemy of good –decision.
In the meantime, enough supplies were to be flown in, particularly gasoline, to give the army 30mls' mobility, he had heard that the army's vehicles had fuel for only 18mls (the gap between 6th A and LVII PzC was 35mls) In fact COS of 6th A reported on 21. Dec that the army had fuel only for 12mls, so only 1/3 of the distance between 6th A and LVII PzC.
So, as often, good sources spoils a good old black and white stereotypes. Manstein didn't try to "to convince Paulus to move out but Paulus refuses until he receives orders from Hitler." on 19 Dec. But on 21 Dec his COS contacted COS of Paulus and they talked on possible break out, COS of 6th A said that the breakout could began on 24 Dec but added that he and Paulus regarded the evacuation under any circumstances as an act of desperation to be avoided until it became absolutely necessary. The conference ended on that indeterminate note.
Personally I have much more trust on professionals like Kehrig and Ziemke than a book which title is "Hitler: The Pathology of Evil".
Juha