Steve Nicol believes that Kai Havertz may be about to give Mikel Arteta a real problem after the German scored for Arsenal in their emphatic victory over Brighton on Saturday. Arsenal made yet another statement with their performance on the south coast. The Gunners responded to Manchester City’s victory earlier in the day by producing an assured display against Roberto De Zerbi’s side. Once again, Kai Havertz had a big role to play in the win. Havertz bagged his ninth goal of the Premier League season to double Arsenal’s lead during the second-half. Given how good the Gunners’ defence has been…