By Tom Blow Newcastle’s coaching staff compare star striker Alexander Isak to Arsenal legend Thierry Henry, according to Alan Shearer. It’s believed the Gunners are interested in signing Isak, 24, to solve their striker dilemma. Eddie Nketiah (five goals), Kai Havertz (four) and Gabriel Jesus (three) have all struggled to score in the Premier League this season, causing Arsenal to slip down the table. Mikel Arteta’s stuttering side are now in fourth – five points behind leaders Liverpool \- after a run of three Premier League games without a win. They were also dumped out of the FA Cup at home…