This basically. Everyone who thought Bret came back to bury the hatchet with Vince & co. were wrong I think, main reason was because Vince owned Bret's career and, to an extent, life's work. Better to play ball with the guy and get your story told in a complimentary fashion so that future generations can look back at what you did than go the other way.
I remember reports months before Bret's Hall of Fame entry and DVD package that stated that a Self Destruction of the Ultimate Warrior style DVD was in the works for the Hitman called something like Screwed: The Bret Hart Story. I genuinely think Bret was pretty much told that would be his legacy unless he came back and that's what swung it.
For Sting I guess he has a choice of working with them and getting a Sting: Definitive Collection style boxset or probably he gets nothing at all. Sting is just packed away as just a part of the WCW story and in about twenty years time most have forgotten he ever existed.