Question: Who was Julio Alberto Castillo Rodríguez arrested with that was  suspected U.S.-born Mexican drug lord and former high-ranking leader of the Jalisco New Generation Cartel (CJNG)?

Context paragraphs:
Jalisco New Generation Cartel: The Jalisco New Generation Cartel (Spanish: "Cártel de Jalisco Nueva Generación" , "CJNG" and "Matazetas") is Mexican criminal group based in Jalisco and headed by Nemesio Oseguera Cervantes ("El Mencho"), one of Mexico's most-wanted drug lords.  The CJNG are currently fighting the Knights Templar Cartel and Los Zetas for control of the cities of Guadalajara, Jalisco and the states of Michoacán and Veracruz.  The CJNG also operates in the states of Nayarit, Colima, and Guanajuato.  While this cartel is best known for its fights against the Zetas, it has also been battling La Resistencia for control of Jalisco and its surrounding territories.

Rubén Oseguera González: Rubén Oseguera González (born February 14, 1990), commonly referred to by his alias El Menchito, is a suspected U.S.-born Mexican drug lord and former high-ranking leader of the Jalisco New Generation Cartel (CJNG), a criminal group based in Jalisco.  He is the son of Nemesio Oseguera Cervantes (alias "El Mencho"), one of Mexico's most-wanted drug lords.  Under his father, he allegedly worked as the CJNG's second-in-command and managed international drug trafficking operations.

Abigael González Valencia: Abigael González Valencia (born October 18, 1972), commonly referred to by his alias El Cuini, is a suspected Mexican drug lord and former leader of the Jalisco New Generation Cartel (CJNG), a criminal group based in Jalisco.  He was also the head of Los Cuinis, an organization allied to the CJNG.  Along with his brother-in-law Nemesio Oseguera Cervantes (alias "El Mencho"), one of Mexico's most-wanted men, González Valencia reportedly coordinated international drug trafficking operations in the Americas, Europe, and Asia.  He was also responsible for managing the financial operations of the CJNG and Los Cuinis.

Nemesio Oseguera Cervantes: Nemesio or Rubén Oseguera Cervantes (born July 17, 1966), commonly referred to by his alias El Mencho, is a suspected Mexican drug lord and leader of the Jalisco New Generation Cartel (CJNG), a criminal group based in Jalisco.  He is one of Mexico's most-wanted men, and the U.S. government is offering up to US$5 million for information that leads to his arrest and/or conviction.  He is wanted for drug trafficking, organized crime involvement, and illegal possession of firearms.  He is reportedly responsible for coordinating drug trafficking operations in the Americas, Europe, Asia, and Africa.  Under his command, the CJNG became one of Mexico's leading criminal organizations.

Tijuana Cartel: The Tijuana Cartel (Spanish: "Cártel de Tijuana") or Arellano-Félix Organization (Spanish: "Cártel Arellano Félix - CAF") is a Mexican drug cartel based in Tijuana.  The cartel once was described as "one of the biggest and most violent criminal groups in Mexico."  However, since the 2006 Sinaloa Cartel incursion in Baja California and the fall of the Arellano-Félix brothers, the Tijuana Cartel had been reduced to few cells.  In 2016, the organization has become known as Cartel Tijuana Nueva Generación (New Generation Tijuana Cartel) and has begun to aligin itself under the Jalisco New Generation Cartel, along with Beltrán Leyva Organization (BLO) to create an anti-Sinaloa alliance, in which the Jalisco New Generation Cartel heads, creating a possible powershift in Mexico.

Julio Alberto Castillo Rodríguez: In June 2015, he was arrested in Jalisco along with his brother-in-law Rubén Oseguera González (alias "El Menchito"), and imprisoned at the Federal Social Readaptation Center No. 1, Mexico's maximum-security prison.  He was released a month later for lack of evidences.  Mexican federal authorities re-arrested him in April 2016 for his alleged involvement in the CJNG.

Dionisio Loya Plancarte: Dionisio Loya Plancarte (born 21 October 1955) is a Mexican drug lord and high-ranking leader of the Knights Templar Cartel, a quasi-religious criminal organization based in the state of Michoacán.  He is the uncle of Enrique Plancarte Solís, another former high-ranking leader of the cartel.  Since 2009, he was listed as one of Mexico's 37 most-wanted drug lords, with a $30 million pesos (USD $2.3 million) bounty for information leading to his capture.  He was arrested by the Mexican Army in Morelia, Michoacán on 27 January 2014.

Gerardo González Valencia: Gerardo González Valencia (born  1976 ) is a suspected Mexican drug lord, money launderer, and former high-ranking leader of Los Cuinis, a criminal group based in Jalisco and allied to the Jalisco New Generation Cartel (CJNG).  He is the brother of Abigael González Valencia (alias "El Cuini"), the former leader of Los Cuinis and the CJNG.  He was allegedly responsible for coordinating international money laundering schemes by using shell companies to purchase assets in Latin America, Europe, and Asia.

Antonio Oseguera Cervantes: Antonio Oseguera Cervantes (born August 20, 1958), commonly referred to by his alias Tony Montana, is a suspected Mexican drug lord and former high-ranking leader of the Jalisco New Generation Cartel (CJNG), a criminal group based in Jalisco.  His brother is Nemesio Oseguera Cervantes (alias "El Mencho"), the leader of the CJNG and one of Mexico's most-wanted drug lords.  In Mexico, he was formally charged in 2015 for drug trafficking and being in possession of military-exclusive firearms.

Elvis González Valencia: Elvis González Valencia (born October 12, 1980), commonly referred to by his alias El Elvis, is a suspected Mexican drug lord and high-ranking leader of the Jalisco New Generation Cartel (CJNG) and Los Cuinis, two allied criminal groups based in Jalisco.  He was reportedly responsible for managing international drug trafficking operations and money laundering schemes under his brother Abigael González Valencia (alias "El Cuini") and brother-in-law Nemesio Oseguera Cervantes (alias "El Mencho").

Supporting paragraphs: Julio Alberto Castillo Rodríguez Rubén Oseguera González
Answer: Rubén Oseguera González