I dont know, I think Simeone makes the team look better than the sum of their parts.
Most of their "star players" end up being a dissapointment after leaving Atletico, I mean besides Diego Costa and Courtouis with Chelsea all their other players have not been the same, to say the least, when moved to another team at this goes a long way back.
Griezmann to Barca, Rodri to City, Lucas Hernandez to Bayern, Godin to Inter, Felipe Luis to Chelsea, Miranda to Inter, Theo Hernandez to Madrid, Arda Turan to Barca, Falcao to Monaco, etc
Funningly the ones that failed at Atletico end up playing better in other clubs such as Alderweireld, Raul Jimenez, Diego Jota to mention some.