I admit I had never heard of this before he posted that wiki link, but from what I read in the article, you're really stretching with the idea that they were some sort of good slave owners. This part in particular jumped out to me..
"Indian slaveholders bought and sold slaves, often doing business with white slaveholders in the neighboring states of
Texas and
Arkansas. The owners in both areas always considered enslaved Africans to be property.
After the revolt, the Cherokee often hired non-slave holding Indians to catch runaway slaves. In the past, some of these people had struggled to eat, while slave-owning families flourished in a market economy driven by slave labor. Some among these once poor Cherokee became wealthy by providing services to the 'rescue' company in catching fugitive slaves. When slave catching expeditions were mounted, such trackers were paid. They were also authorized to buy ammunition and supplies for the hunt, at the expense of the Nation (provided that the expedition was not “unnecessarily protracted and did not incur needless expenses”)."