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Some types of leather have very little draw - horsehide in general, and cordovan (shell) in particular - and don't tend to develop much more as stropping progresses.

Draw doesn't change as you near completion, at least not strictly speaking. It changes as you do more and more laps on the strop, which compresses the leather a bit, flattens out the minor bumps and...

It's just the friction between the blade and strop.

You get more draw as stropping progresses, but it doesn't really have anything to do with the edge aligning, but with the nap of the leather getting pressed down and providing more friction. If the...