Maybe SSJ4 will be addressed with the Multiverse lol. Also, I don't know why people are saying Toriyama is ripping off anything. The people who made a fanfic are ripping Toriyama off and since he owns the sole rights and property of DB and everything releated, anything the fanfic says is his property by default.

Idea wise, no one knows whether or not it would have went this way. This is Toriyama continuing the story. That's all I am content with.