I don't think that there was a contract issue. The original cast said many times that there weren't any issues from contracts and they've also mentioned how they're freelance voice actors.
That doesn't make too much sense to me. Just because the PUSA cast have settled into their roles mean that it would be jarring to suddently switch back to the old cast? To me, that's like saying it would be too jarring to change the original cast after eight years of settling into their roles for a new cast. PUSA could change the cast if they really wanted to, as they have done before, but they're not interested in that at the moment.
I don't see how that came into the conversation myself. I'm also not sure how the fact that she gets few cameos in the show means that Rachael Lillis couldn't voice her, especially since she can voice other characters on the show.
I respect the new cast and I think that they've improved quite a bit from Battle Frontier. However, I still prefer the original cast for the way they handled their characters' emotions all those years. Plus, aside from a bit more of the original background music and a different cast, PUSA pretty much does the same kind of dub that 4KiRAB did. So, they really could have kept the original cast, which I would have preferred so much, and they still would be the doing the same quality of the dub. I honestly wish that the remaining original cast merabers could reprise their roles, but I know that isn't going to happen anytime soon.