None of the revision is credited to James Lapine, and I think George Furth might be upset if he knew someone thought that. Lapine was allowed to make some changes for Encores! I wonder if Sondheim was given the power by Furth to make all these types of decisions for the shows they wrote together. Most of the changes were just cuts and perhaps some slight restructuring within scenes, but there was the one big change in the last scene, which Sondheim, rightly, seems to have decided was a mistake.
I wonder what Furth would think of the new Company.