The Watford game was pretty much Exhibit A why we need someone like him. Philogene misses a penalty and we end up losing a game we should've won. Put Billy on that penalty and we probably win the game and it's an 3 extra points
Put Tufan on for that penalty and we probably win the game. It's not really as simple as saying 'if we put a good penalty taker on we'd have scored the penalty'. He'll likely come on for the last 20-30 minutes of games. We missed the pen on 60 minutes.
If he scores 4+ then I'll be happy, anything less and it'll feel a bit of a waste - depending on the context of the goals I guess.