You say colonialism opened up Kenya to the global market. But nearly every country in the world, the colonized and the uncolonized, is now part of the global market, so it is not true that Kenya would not be part of the global market today without it.
The argument goes -- and I think there is a lot to this argument -- that using "remnants of colonialism" to refer only to, for example, an extensive bureaucracy that excludes people who produce much of its proceeds is misleading, because other extensive institutions that are also remnants of colonialism are an important part of commerce, law and order, and public welfare all over the world.
Who said police, courts, etc. are not remnants of colonialism? Also, what is the relevance of that to this discussion about coffee selling and the problems in the Kenyan coffee market?