Hey, newcomer to this thread here. I see a lot of potential in K. Rool, so I would love seeing him as DLC.
I can understand why the veterans didn't get CGI trailers, since they don't need as big of an introduction. Even Sonic's trailer didn't have a CGI segment, but that was probably for the same reason as the other veterans.
Ryu's CGI segment was all he needed to be introduced, it was short, but that's because it was a replica of the Super Street Fighter 2: Turbo introduction, and that was all he really needed. Ryu and Street Fighter is all about the technical gameplay, not fancy cutscenes.
I feel like the Ballot characters might get some CGI treatment. The Ballot is a HUGE deal, and I think the Ballot characters will be revealed similarly to how the other newcomers were revealed before DLC was a thing. Don't take my word on it, I'm just guessing.