Honestly playing Halaand had helped Man City though the team performance dropped this season, however the inclusion of Halaand in most their matches as their main striker is a threat to their opponent defense line though he might have few touches throughout the duration of the match and in most cases two of their opponent defenders often mark him thus creating chances for his other team mates, however I believe Guordiola made a mistake by selling Alvarez to Atletico Madrid had he stayed in Man City he would have helped the team this season just like in the absence of Halaand few seasons ago he always live up to expectations.
Haaland is still in his best of form till date and his inclusion in most games have really helped Manchester City win many matches through his efforts directly or indirectly. He either creates a chance for the team to score or he scores the ball him self. Without any much research, I can guarantee that he's the highest goal scorer in the team right now.
Manchester City is at its 4th position right now in the table standing but their relatively poor performance have bit really suggested that they might never win the top place of the table with Liverpool currently leading with a landslide point of 67 , 20 points ahead of the Manchester City team. It's a lot of gap to fill and that cannot be done when the club's have all played 27 matches already and are looking forward to only a few matches left to the finish.