By Jamie Spencer Roy Keane has suggested that Arsenal used tactics that football “dinosaurs” would be accused of resorting to in their 2-2 draw with Manchester City last weekend. The Gunners were leading 2-1 at the Etihad Stadium but then saw Leandro Trossard sent off in first-half stoppage time. The tactical instructions from Mikel Arteta after the break were clear, with Arsenal sitting deep, at times with six defenders, and leaving no one up front. It almost worked, stifling what Manchester City could create by completely squeezing the space in and around the penalty area. But the resistance…