Most of that I can agree with--the rub comes in with the speed of recovery with a given material.Feathers vs. steel isn't a difference in recovery, but it does show that there is a difference in materials and their effect even when they weigh the exact same.

Also, the point weight or anything else that effects the amount of resistance from a given arrow will affect the amount of paradox, regardless if they spine the same. It's just my guess that an extra heavy arrow shaft, such as ash, acts similarly to a lighter shaft with a heavier point, which gives more resistance and has to be stiffer to get the same amount of paradox. How much difference this makes probably varies with bow weight and draw length. I have a long draw and shoot fairly heavy bows, so it might be showing up a lot more for me.

Chad