Superstars always color matches and help their team win games in times of difficult games. And when they leave there is always something to miss about them, the fan love, fans switching clubs, and most important the team losing top notch performance. Recently, Marquinhos made a statement that he
misses the days of Mbappe in PSG. He's sure that their draw wouldn't have happened in the watch of a no "9" like him. Also PSG fans would feel the absence of Messi and Neymar's brilliant skills. On the other hand, Manchester United also should be missing those moments of CR7.
What is no longer there in your club after a certain key player was transferred?
I'm not really a fan of Superstars which always color the club. I am more inclined to the club who have good consolidation for each player who can win the match. Usually, when superstar gone, that club will lost their identity, and it also affects with performance overall club. Besides to fix and strengthening the team, usually club recruits a superstar to increase their prestige, then when his gone, the club will lose their performance also and of course, will also lose their fans following the superstar go.