I'll give a less dismissive answer to this.
I don't think it's a very good idea to use individual player statistics for a team game, ranked by quantity, as evidence of their level of performance, because these numbers are not a one-way relationship. The team conditions the player's numbers.
Last season Barcelona played the most attacking football of any team in La Liga. They scored almost 20 more goals than RM and Atletico, but conceded 10 and 13 goals more than either of them. To a certain extent, Messi is responsible for the numbers being so high. But in another sense, Messi's numbers benefit from being in the most attacking team and having all play go through him. It makes him very likely to post very high numbers.
You mention key passes. Messi had 77 last season. But the 2nd most key passes were by a guy called David Ferreiro, who plays in Huesca. Other players on that top 10 are Kroos, Aspas, Canales, and Jesus Navas. This is, to a large extent, telling you people's roles in a team, not their ability.
A simple example is Benzema. Last season he was playing for a defensive and frankly boring RM team. He was not in the top 10 for key passes, had considerably less shots on target than Messi (and a similar number to Rafa Mir from, again, Huesca), was 5th in assists (and not in the top ten for assists/90), was not in the top 10 for passes into the penalty area, was 10th for shot creating actions.
This season RM are playing more attacking football. And now Benzema is 6th on key passes, averaging more shots on target per game than last season, 2nd on assists, 1st for passes into penalty area, 4th on shot creating actions... He's averaging more goals+assists/90 than Messi last season.
While I think he's having a good season, this increase in the numbers is mostly because we're playing different football.