In cocaine Cowboys, JOhn ROberts said the COlombians brought their own people over to move the cocaine they smuggled, they had their own distribution.
It seems you could make a place with them if you had transportation in the states, or contacts in markets for distribution that they didn't, mainly cities with low Colombian populations, but then they were likely to deal with either Spanish speaking ethnic groups, (Dominicans) or groups strategically placed like JAmaicans, or both like the Mexicans. But above all if you had the money for a large load, they would deal with anyone, if I'm not mistaken Griselda Blanco was the Medillin top distributor in the states, not sure about who CAli had working New York