Using mkeller's pic here...the surface of that locknut extends past the edge of the arm of the RD, so when you cinch it up against the integrated hanger the RD is still free to pivot. If I have a Suntour RD that had a claw...the claw is threaded, so when the hanger bolt is run through it you stop just short of the claw, then the lock nut from the other side sets that "gap" allowing the RD to pivot.

But, If I remove the claw and mount directly to the integrated hanger the RD arm cinches up right against the hangar (since there's nothing to space as in the captive bolt scenario) locking it in place and not allowing it to pivot. In previous attempts the hanger bolt has been too short to go through the integrated hanger (which has always been thicker than the claw) and leave enough threads for good purchase for the locknut on the other side. In this scenario the integrated hanger would "replace" the claw...it's just that the increased thickness of the integrated hanger doesn't leave enough thread on the bolt for a locknut (and I did find some 10mm jam nuts...still not thin enough).

Does that help? Pics tonight if it doesn't.