El Mencho's Stepson Confirmed as CJNG Leader — Chapitos' External Alliance in Flux

El País confirmed on April 6, 2026 that Juan Carlos Valencia González — stepson of the late CJNG boss Nemesio 'El Mencho' Oseguera through his marriage to Rosalinda González Valencia — has formally assumed command of the Jalisco New Generation Cartel, following El Mencho's killing by Mexican Army forces on February 22, 2026 in Tapalpa, Jalisco. The Wall Street Journal had first reported Valencia González's rise on March 18, 2026. The CJNG leadership succession has direct implications for the Sinaloa conflict: Los Chapitos forged a tactical alliance with El Mencho in mid-2025, deploying hundreds of CJNG fighters into Sinaloa to fight La Mayiza. Security analysts assess that Valencia González — younger, less battle-tested, and focused on consolidating CJNG's internal coherence after El Mencho's death — may be less committed to the expensive Sinaloa deployment. The Chapitos now face a strategic inflection point: their primary external patron is dead and the alliance with a new, untested CJNG chief is uncertain. La Mayiza, which controls approximately 90% of former Chapitos territory, may exploit this window to press further advances.