Newcastle United made a big tactical mistake against Arsenal on Saturday night. That is the view of Perry Groves, who has been reflecting on Newcastle United’s dismal performance against the Gunners this weekend. Eddie Howe’s side lost 4-1 at the Emirates Stadium, unable to get close to the Premier League title challengers. Arsenal were dominant, while the Magpies were fairly embarrassing. The only positive was Joe Willock’s return from injury. This was meant to be a battle, but it was actually a stroll in the park for Mikel Arteta‘s side. They had complete control, while Newcastle played into…