I'd had the same thought that Darby did, regarding Luke/Vader...
Kenobi, Yoda, etc., didn't see Vader as a redeemable person, and so they looked at him as someone that had to go, to get things back to normal. Luke even made the impassioned plea that his father had good and he felt it, and Kenobi denied this and said he's more machine than man, twisted and evil, yada yada yada.
I felt, like Darby said, that the redemption of Vader was more of a bonus than anything, for Luke.
At the same time, I think Luke's take on the force is going to be wildly different than what the original Order has... I think there were already Jedi heading in that direction (QGJ for instance) but that with them all wiped out and Luke starting from scratch, he kind of would take his own experiences into account in recreating the order. I cannot imagine he'd shun family/love like the old older did, when it was family and love of family that ultimately won the day at Endor. It's possibly even familial connection that he and Leia have that saved his own life at Bespin even.