my take on this: midsole is irrelevant, natural crepe sile can be cut/sliced and leave thin layer of crepe, then you glue new layer of crepe.
I believe gluing 2 dissimilar material will make it worse.
I learn this when resoling leather sole boots with cristy sole, swapping to rubber midsole and restitch to the original welt, help the rubber sole to adhere better. I also have other boots with leather midsole and cristy sole glued together. Currently both still in good condition so my theory of gluing 2 different material is not that good idea, has yet to be proven.
Sorry to dig up an old quote, but I have a somewhat related question. I'd like to use the Vibram cristy sole for my next pair of Rancourts. I've noticed that almost all examples of the cristy I've found online include a somewhat prominent midsole. My concern is that the cristy sole itself is already pushing the limits for how thick/high I'm comfortable with a shoe sole being.
Is the typical leather midsole, used in combination with the cristy, necessary? And if so, am I best off just asking Taryn/Kyle to use a thin leather (rather than the thick leather midsoles that seem to be common)?