I am pretty certain that there is a TP and I also think that the TP can win the game if we go another night with them alive, essentially the reason why the game continues now.
The TP goal has to be connected to the infection deal, nothing else fits the bill. Seems like it has been something that can't happen every night. If we just lynch Retal, the TP can hit another player. If the infection is like an arsonist, that would be enough to win.