i think they will because raidou is far more dangerous then phase i know phase is a official tag team with kasumi but will that be in the story too ?
This is pure speculation, but my guess is that in the end Phase 4 will oppose the creators of project M.I.S.T.: Victor Donovan and Rig Donovan and not necessarily Cyber Raidou. Allow me to explain.
Like Kronin already said, Phase 4 doesn't like to inflict pain to people. This means that Phase 4 not only inherited Kasumi's appearance, but also (part of) her personality. Since Kasumi is dedicated to destroying DOATEC, I don't think their primary goal is killing Raidou. Whether she'll work together with Kasumi, I don't know but I think DOATEC will be destroyed by the ninjas eventually. In short, DOATEC will probably be the target of Kasumi (and possibly Phase 4), but not Cyber Raidou.
About Cyber Raidou: There is too little known of him to make a good prediction, in my opinion. He might be forced by Donovan to work for him, or he might be that powerful that he'll walk his own way. I can't really predict how Kasumi and Phase 4 would react to the reincarnation of Raidou. Rather, I think Ayane and/or Hayate have a stronger desire to kill Cyber Raidou. Seeing this as a vendetta, I expect them to be involved in hunting him.
By the way, I heard that the city you live in, is a reeallly cool city!!
010 forever