I'm not too surprised that there's some bitter feelings among the original cast. I would consider that a totally reasonable and understandable reaction to being replaced on a show after nearly a decade. Although, I have heard from other people online that they have talked to Veronica Taylor about their work on Pokemon at different conventions. They just won't do their voices for the characters on camera due to some kind of legal issue or something like that. I could also understand the tension between the different sets of cast merabers, but I thought that they would have more tension against PUSA since it was the company that set up the replacements.
I wouldn't be surprised if NOCG didn't know the answer since he may not be able to answer the question. Besides that, even if he did, you have a good point about how he might not be able to address the answer to the public.
As for Eric Stuart's roles, I never had a problem with how his voices for Brock and James changed. Brock always sounded cool to me and I liked how energetic his voice for James became overtime. It made him sound funnier in certain moments. Although I still prefer Eric Stuart's voice for Brock, I do think that Bill Rogers is doing a good job with his voice for Brock and I consider him the best out of the new cast. As for James, I have to admit that his new voice actor has been able to pull off some emotional/sad scenes than Eric Stuart might have been able to, even though I like his voice for James more than his PUSA voice.
It would be cool to hear Rachel voicing Misty again. Considering that Misty hasn't appeared since PUSA took over, with the exception of that tenth anniversary special, it seems possible that she could reprise her role as Misty. I also would love to see her voicing Jessie too. I used to like Michelle Knotz's voice for Jessie, even during Battle Frontier, but for awhile now, it feels too high pitched for me.
I've heard of how he also enjoyed doing Kaiba for Yu-Gi-Oh!. I didn't mind how Brock sometimes sounded like Kaiba. The only times where I could really tell that he sounded more like Kaiba was when Brock was serious and/or angry. I also agree with you about how Dan Green did a nice job with voicing Atem. I thought Yugi was fine myself, but I can see why you would say that he sounded whiny. Just so you know, the character Eric Stuart voiced in Slayers was Gourry. After talking more about the VA change for Pokemon than I have for awhile, it makes me appreciate Funimation even more for getting the core cast of Slayers back for the new series.