Theory About Danny (The Music Awards)
Okay, ignoring the fact that he's not voiced by Scott Menville, hear me out:
Danny from the two parter "The Music Awards" and Danny from Sunbow's other series My Little Pony & Friends look almost exactly alike, they just have different outfits.
So I'm thinking that after My Little Pony ended, Megan, Molly and Danny's parents got divorced, and while Megan and Molly stayed with their mother on the farm, Danny's dad got custody of him and moved to Los Angeles and started drinking heavily, taking it out on Danny.
The VA difference could be explained as Danny just having gone through puberty and gotten older. I kind of wish that Christy Marx had been able to do the follow up episode where Danny and his dad are reunited, but I just noticed the design similarities between the two and just theorizing.
https://www.fanfiction.net/u/5423577/Bobbydrake2000