After seeing their title challenge collapse last season as Manchester City won their third in a row, Arsenal regrouped over the summer, invested well and now look ready to go one better. Declan Rice is the biggest example of where Arsenal have nailed their recruitment and the Englishman looks like he’s worth every penny of that £105m outlay. The 24-year-old has proven to be the missing piece in their midfield, the one capable of shielding the defence but also grabbing the headlines in the final third. Against Luton on Tuesday night, Rice certainly seized the opportunity to write his name on th…