There are two phases to the goal. Phase 1, the defenders miscommunicate, and the center backs push forward, leaving others in the wall back. Phase two, Saliba is stuck up while Boye scores. This is what I was referring to when I said over the two games, their defense has shown multiple instances of poor communication. The second goal by Brest was another such instance.
You could be right about the man of the match. There does seem to be some nationalistic ire towards Arsenal