1

For an in-universe answer, the first draft of Furious 7 (then titled Fast & Furious 7) actually featured Sean coming to Los Angeles to work with the crew, much to Roman's dismay as he didn't believe in drifting or that a kid was friends with Han. However, his entrance did not involve going to Tokyo, and rather ending with the hospital scene with Dom ...


Only top voted, non community-wiki answers of a minimum length are eligible