ガルフ・カルテル
Without a clear successor of Costilla Sánchez, his faction – the Metros – could come to an end, although it is still likely that there are other old-crime bosses of lesser importance still trying to keep the Gulf Cartel operating. With the arrest of a Gulf Cartel representative in Colombia on 10 September 2012, the drug business could be disrupted even further. One clear benefactor of the fall of the Gulf Cartel is its rival group, Los Zetas. It is also possible that several within the Gulf Cartel may decide to join the Sinaloa Cartel or Los Zetas, although the latter seems unlikely given the bitter feelings between both groups. The Mexican government has essentially gotten rid of the leadership in both the Metros and the Rojos factions in the Gulf Cartel. The first possible group to take control of the smuggling routes in Tamaulipas is Los Zetas, who can decide to make a violent push into the last territories of the Gulf Cartel and finally take control of Matamoros, Tamaulipas. That city is the birthplace of the Gulf Cartel and has been the stronghold of the cartel ever since its creation. By taking Matamoros, Los Zetas will not only take a valuable drug corridor from the hands of the cartel, but it can score a major "psychological victory" over the Gulf Cartel.