Sergio Busquets has been one of the most unbelievable players on the planet. Widely considered to be the best pure defensive midfielder in the world, he is the rock upon which tiki-taka stands. His style has been virtually mistake-free for half a decade, and his defensive stats are ridiculous when you consider Barcelona average 65-70% possession every year.
(Defensive rate stats are limited by opportunity. If your team has the ball, you can't make a tackle or an interception.)
All of this has been true for half a decade. Until... this year? No one is saying Busi has gone bad, but something at Barcelona this season definitely caused his stats and radar profile to dip. This will be something to keep an eye on for next season and maybe... for the World Cup?