Just like my expectation, Manchester City can score 2 goals on the second half. The first score by Luton Town is just to make people heated since it's not fun anymore if Manchester City was able to score on the first half. 
Chelsea plays like rubbish and Cole Palmer is too selfish, they don't have players who can coordinate a team well, the players play without any teamwork and Pochettino is quite poor in strategy, it's a shame to see a team built with huge amounts of money this season hasn't shown anything impressive, all their results are just random.
He wasted many chances, shot five times and get nothing. Losing to Everton is unacceptable, Chelsea isn't yet evolving, they're similar like Manchester United which used to lose against weak clubs lol.Fullham scored 5 goals in that match and West Ham seemed to do nothing to respond to Fullham in that match.
Moyes was trying to make an experiment West Ham to play with defensive strategy, unfortunately it not goes well. So I think this defeat was just a lesson for them.