I think Nick came back to the group with the understanding that the show would be the same as it was when it was shut down in 1967. And most of the time, it was. George was kind of a preservationist, and wanted the group to do more than just bang out the chords. I think the rift may have only been during the era of LIVE AT THE CRAZY HORSE. Either I read, or I heard somewhere that Nick declared; "that's the last time I learn new material" after that album was released.
As for Bob having the kind of overseeing the group that Nick, Frank and (sometimes) Dave had during the 1970s? I don't think Bob's worried about that. Either folks will go see the new group, or they won't. He's probably banking on the material meaning more to people than the performance.
Nick, Frank and Dave came down on the Bob-Jim-Pat era, because of the humor in the NKT shows. Apparently, Dave couldn't deal with the jokes aimed at the "boozing" crowds, with sexual innuendo, etc. Nobody was complaining about how they played. Like I've said, Bob Haworth once posted that Connor and Horine were let go after they requested more money from Mr. Shane.
Also, if you can negotiate your way on line to get to Jerry Kergan's KT "bookshelf" pages, you can find a few magazine articles written during the mid 1970s, when Nick, Dave and John almost started an act of their own. This was between 1974-1976. According to Nick, Dave wanted to be back in the act (or "an" act) with Nick. In the end, it never worked out. Nick didn't want to travel and John had his own solo career from RCA to RSO records. Dave wanted back in the game then, and Bob knew it. Dave was never much as a solo act, so he needed a group. Don't think that all that activity didn't light the fire under Bob to buy THE name.
One of the more recent thing that Bob did was come down on Pat Horine a few years before he died. Pat was doing gigs with a couple other guys as "The Kingston Tribute," and was asked nicely to stop.