A bit while before, I came up with a theory about the 3D and HD Universe, about the characters.
I posted this a few days ago in a thread in the GTA V section, so I'll just copy-paste it here.
I think characters from 3D universe does appear in the HD Era, they're maybe just a HD universe redention, They're not the same person we see in the 3D universe, but is the same person.
Confused? Me too, It's kinda hard to explain.
Take this for an example, Carl Johnson is in the HD universe, he may exist but not the same one we see in the 3D universe, he didn't jump universes, Like he's still a member of Grove Street Families, but in the HD universe.
Another example may be Madd Dogg, he may appear in the HD universe, but he's not the same one we see in the 3D universe, he's still a rapper though.
Hell, maybe the events that happened in the 3D universe did happened at the HD universe, Like Claude's story, his quest for revenge may happen in his HD universe version, but it happened in the HD universe LC.
I'm sure you get what I'm saying from the examples above, maybe not, I can't explain it much.
It's just my own theory though, what do you guys think?