I think that idea would work if it was Javier Bardem's character finally getting out of prison and wants revenge. Since Jada Pinkett Smith doesn't die and Jamie Foxx is a witness / knows about the contract, there's a good chance that he ended up going to jail.

I guess the twist on the old formula would be that they kidnap Jada Pinkett Smith and force Jamie Foxx to carry out assassinations in one night.

Edit: also they probably still don’t know that he isn’t actually Vincent. Vincent is a “ghost” and no one would know about his death, especially with the whole “no one noticed a corpse on the train” bit.