1 - Agüero is back to his best
Sergio Agüero was in lethal form in this game. A second hat-trick in three home games eased his side to three points here and his fourth goal was sublime. A hard, swerving effort that despite being central left Kasper Schmeichel helpless. With the Champions League knockout fixtures on the horizon and a lack of strength in depth at the striker position, Agüero has come up big just when Manchester City needed him most.
2 - You need defensive width to stop City
Claude Puel started the game with a back five and an early City goal aside, it worked in stifling the home side. The key to this was the defensive width Leicester had which restricted City from playing out wide. However, Puel decided to change to a back four at halftime and this drastically cost him. City had more room to maneuver and stretch the Leicester back line which created many opportunities.
3 - The sooner City can mathematically win the league, the better
With a squad hit by injuries, Pep Guardiola could do with resting some of his big players during league games in preparation for the Cup matches. The manager is not one to risk anything before it is mathematically won though, so the sooner City are confirmed league champions, the better for the fitness of the squad ahead of big Champions League and FA Cup games.