Here is an excerpt from this BBC News article:
"Mexican police have arrested one of the country's most sought-after suspected drugs bosses. Gregorio Sauceda Gamboa was arrested in a raid on a house in the city of Matamoros, near the US border. He is accused of being one of the kingpins of the notorious Los Zetas drugs gang, the armed wing of the Mexican Gulf Cartel. Police consider Mr Gamboa, 44, to be a founder of the gang... As well as being on a list of most wanted drugs suspects in Mexico, he is also wanted by the US Drug Enforcement Administration." Link to Full Article
Analysis: At first sight, I thought this was a pretty big deal, as Sauceda Gamboa was in the upper echelon of the Gulf cartel's org chart. Then I read Strategic Forecasting's analysis of the arrest, and I was considerably disheartened to learn it's not as big a deal as I thought, although it's still a good victory for the Mexican government. It appears that Sauceda Gamboa was demoted in 2006, possibly due to alcoholism and drug abuse. While he was one of the founders of Los Zetas and a key figure in their initial association with the Gulf cartel, he was supposedly recently at odds with the group. Stratfor speculates that Los Zetas may have provided authorities with information on Sauceda Gamboa's whereabouts, which may have led to his arrest. Gregorio's brother Hector was killed in a firefight in Reynosa in February, possibly under similar circumstances. Either way, it looks like Sauceda Gamboa will be easily replaced, with minimal disruption to Gulf cartel operations.