Turkish is an idiot. Anything he says, do the opposite. His choice for Arsenal manager is Diego Simeone. A manager making 5x what Arteta makes with absolute power in Madrid. His other choices are Allegri and Antonio Conte.
He was the most logical choice post Emery. Arsenal cocked it up. Arsenal's football under Emery was too far removed from what Arsenal were known for and they wanted to win the fans back. Midseason, you're not getting another big manager (Rodgers) and none of the former players connected to the Club have shown any managerial prowess.
Legend or not, he came with good reviews and the hope was he would bring new ideas into Arsenal. IIRC Everton went after him but he wanted the Arsenal job.