He isn't though? Abel/Juri are the main characters in 4 and if the CG opening is any indication V is Nash's gig.
Abel seemed to basically get ignored by the fanbase and isn't even in the follow up to the game he started in. Juri had an important role but I don't think she was intended or interpreted as the MC.
The CG intro put me under the impression that Ryu is the MC again and his rivalry with Necalli will be a big part of the story.