Actually they duplicated frames originally to slow everything down so they had enough frames to cover the wipe. Originally there was no wipe and it cut straight to vader walking through the corridor.

I wonder if you’ve tried reinserting the deleted scene back where it originally belonged and watching it through?

I said as much in the facebook thread but I really think that scene is important to set up the main ‘father son’ theme of the movie, and that it’d be a stronger film with it in. I don’t think it undermines the later Luke reveal as we only see him hooded.

I think for many people, reinserting that great scene would make Revisited the definitive version of ROTJ (where along with the ‘father son’ drama, we also get to see an extra Death Star corridor set built by the production, we see the parked Falcon and XWing, and we see Luke tooling his new lightsaber - all v.cool).