Cut Toretto and the series would improve greatly. They could actually tell some interesting stories that don't involve Vin Diesel burying the rest of the cast like the lovechild of John Cena and Triple H.Han. Must. Return.
Nothing else matters. You can barely do this without Paul Walker. He's integral. But it can be done if you're not cutting out beloved characters like Han. I even find Tyrese and Luda to be fairly important. It's really only Statham that the series could afford to lose. He adds nothing as a character.
Lol man I feel like Tyrese has been handling this poorly. Out of all the characters he's the most replaceable by far. I wouldn't be surprised if we hear he's left the film in the next few months.