premise: Arturo Guzmán Decena (a.k.a. Z-1) (13 January 1976 – 21 November 2002) was a Mexican Army Special Forces operative who in 1997 defected to the Gulf Cartel and subsequently founded the criminal syndicate's enforcement wing at the behest of drug baron Osiel Cárdenas Guillén. Known today as Los Zetas, the cartel's armed wing ultimately broke apart and formed its own drug trafficking organization.
hypothesis: Arturo Guzmán Decena was asked to defect by Osiel Cárdenas.
reason: We know that Osiel Cárdenas asked Arturo Guzmán Decena to founded the criminal syndicate's enforcement wing but it is after he had defected. The reasons for his defection were not listed. Therefore "Arturo Guzmán Decena was asked to defect by Osiel Cárdenas." is  neither definitely correct nor definitely incorrect. It fooled the system because it did not understand that "subsequently" means after and the two events (the defection and the foundation of the wing) have different reason of being.