By Scott Trotter Kai Havertz has lauded Arsenal’s defence for their role in the Gunners’ 3-0 win over Brighton. Bukayo Saka scored a penalty on his return before Havertz and Leandro Trossard extended Arsenal ‘s lead to send Mikel Arteta’s side top of the Premier League. The match also saw Arsenal secure a fifth consecutive clean sheet away from home for just the second time in their history. The north London side’s backline has proved pivotal in establishing Arsenal’s presence in the Premier League title race. The likes of William Saliba and Gabriel have ensured that nobody has conceded fewer …