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Rhetorical. Same thing in my experience.

Well guy's,

I hate to be the one descanter among us, but I have had some blindingly keen edges from my cotis easily as keen as my Jnat L5 or nani 12K, even crox. To me its a smoother edge...

I just use the BBW side from a creamy slurry, lots of dilutions on circles. Ease up on pressure progressively to weight of razor.

Yes, absolutely yes, of course you can.
Not withstanding variation among naturals, I don't find a lot of difference to the coticule side (at least the ones I have).
Cotis and BBW are not easy to...