It looks like the code would work just fine with only 2 ping-pong buffers. https://github.com/KosRud/DQ-skinning-for-Unity/blob/9d096e2db57677f0f67a823432f8b735ad622404/Code/DQ%20skinning/DualQuaternionSkinner.cs#L537-L539
It looks like the code would work just fine with only 2 ping-pong buffers.
DQ-skinning-for-Unity/Code/DQ skinning/DualQuaternionSkinner.cs
Lines 537 to 539 in 9d096e2