Allen EdmondsMen's Park Avenue Cap-Toe Oxford Dress Shoe

Fit true to size? Or drop in length and go up in width?

Are these firsts or seconds quality?

I don't understand the size chart, what is the difference between a size 8.5 b(n) and an 8.5 2e?

I have very flat feet and will need to remove the insole and replace it with one that better accommodates my foot. Can the insole be removed?