There's a reason for the stuff bristled brush if you use the kit correctly. It's to re-nap the suede after using the eraser thoroughly. Many people don't realize this
Don't be afraid to really go at it with the eraser, especially on denim stains. You aren't actually losing fibers of the suede, just pushing it down and smoothing it out.
The stuff bristled brush will bring the texture of the suede back to life. A softer brush like a horsehair brush will not re-nap the suede after it's matted down heavily.