So to recap...
The Inkosi/25 was kind of like the love child between the 21 and the Umnumzaan; Sebenza styling and Umnumzaan technology.
To me, the 31 seems like a combination of the best aspects of the 21 and the Inkosi. This knife can be looked at as taking something great from of each of these knives (Pivot bushing, ceramic ball interface/detent) and drops the polarizing aspects of each knife (no finger scallops, no locating hole on show side scale, no loctite).
In my opinion, this 31 design nails it - game over.
On a side bar - I tracked down an Impinda from a dealer in Alaska a couple months ago. The only CRK I have opened and instantly loved. For the second year in a row, this company has killed it.