What was the question? Regardless of what you rub/strop your blade on it will heat up. Some materials will generate more heat than others. Remember carpet burn? Right after the carpet burn does your knee burn your hand? While there is heat generated, and maybe to some substantial amount, it is localized and it dissipates quickly. So to use a linen/canvas strop to warm the blade before leather, not. I find the leather warms my blades well enough by itself. Sometimes I can smell the leather while I am stropping. It is the friction of heat that is loosing the aroma of the leather. I haven't seen any smoke yet! I feel the linen/canvas is a very mild abrasive and a step in the refining of the edge. Ask any Hair Dresser, Barber or Taylor to borrow their scissors to cut some paper and watch them cringe! The wood pulp in the paper is abrasive and dulls the scissors. I feel the linen/canvas has similar properties and used properly refines the edge. What I have notices is that if my strop is too cold (saving money by reducing heat) I don't get the same draw as when the strop is warmer. The cooler the strop the less draw. In fact one day my blade skid right off the strop due to the reduced draw being much less than I was expecting. I vote BS on linen/canvas for heat but +1 on using it to refine the edge/reduce burrs. The same effect may be possible w/ leather only but it may take more strokes to achieve the same results.

Good luck in your quest for the perfect edge.