Funny thing is Werner wasn't the one who was missing chances today.
In any case, we can debate till the cows come home about this but Giroud is not going to start the final, for the reasons already mentioned by me and others.
Based on how Tuchel has been setting us up, especially in the big games, he'll start Mount and Werner. It comes down to Havertz/Pulisic/Ziyech for the final spot.