Once the transfer window concludes and the Arsenal players, old and new, head off to their respective international teams, the Gunners face Brighton & Hove Albion at the Emirates. Like Arsenal, Brighton have won both of their opening two games of the season under new boss Fabian Hurzeler, one of the only managers in the league younger than Mikel Arteta. Arteta will face Hurzeler in Saturday’s earlier kick off, and at least one of the two managers will lose their perfect record. Mikel Merino could make his Arsenal debut in the tie, and there may even be another Spanish debutant on show. Arsenal…