There is not any one OC group that dominates in the state of Texas, and it is almost impossible to assign a group as most powerful.
The "OC group" with the most members operating in the state of Texas are the Mexican cartels. According to recent reports, they out number OMC, ABT and TS combined. All of these groups interact with one another, at some level, knowingly or unknowingly, in the drug trade.
And I would imagine the cartels that have the most presence in Texas are the Gulf cartel and the Zetas.
