What is Kai 2.0? Is that the Buu saga? I stopped watching Kai when they cut out the Princess Snake sidequest. The omissions they did weren't flying with me, though it's fair because Kai followed the manga more. As a kid following DBZ, I didn't really know about the manga, so any tampering with the dubbed anime I saw wouldn't work with me.
When Kai first came out, I loved the HD remaster they did, thinking that's all the show was. Aside from a different voice for Gohan, the voices were entirely redone? It wasn't just remastering the original dubbing? I didn't notice differences in those voices, except Gohan. Meh, I liked the original voice actor more, but the Gohan voice in Kai wasn't the reason I stopped following.
After seeing every single episode of DB, Z, and GT, the movies too, as an adult in December 2012 up to February '13, I don't have a vested interest in Kai.
I did watch that special about Vegeta's little brother, and I got to experience the Japanese Goku. My goodness, that was something. I didn't know who the voice actor is, not knowing the person's a woman, not knowing that Goku's voice sounded girly. I tried not to judge too harshly, I think it fits for Japanese anime, there were some girly sounding men before in anime. Ash from Pokemon, at least in the really early episodes, Veronica Taylor made Ash sound like a teen girl. It got better, and iconic, I don't know about the Japanese Ash, maybe the voice is similar because I heard Taylor had to fashion her Ash voice out of the original.
Back to the little special, the one thing I remember from it was Goku saying "AHHH VEGETA!" Vegeta ate his pork, that was hilarious, so the voice can work. But then I saw the Resurrection of F trailer, "FRIEZZAAAAAAA!" Ohhhh, that was kind of funny.
I play it safe, just stick to the original funimation dubs, with the kickass rock music. Although Toonami first aired the Ocean dub, I do recall the voices from that version in the Kamehameha vs. Galick Gun moment. I think that version made it halfway through the Namek saga, and then Toonami rolled out the funimation dub. I never got to see the funimation dub of those episodes Ocean did until 2012. Hearing the "over 9000" in a different voice, even though there were more episodes by Toonami broadcasting the funimation dubs, and Christopher Sabat having the more recognizable voice overall, it's just that one moment. That one moment where only Brian Drummond was the true voice for Vegeta.