He is possibly a player who is pissed off with losing to 35% inferior team whose manager does not even bother attending the matches. There are so many ways to get frustrated with this game. But I honestly think that something is wrong with your statement: if this player is a level above you, that means that at the beginning of the season, his team was at your level or even weaker. So tanking has nothing to do with it: he just made a major investment to get a team as strong as this.