Well if their that good at hiding it that another stutterer couldn't detect then I'd assumed that persons stutter wasn't much of a stuttering issue to begin with. I've met one stutterer in the last 10 years actually hung out with him on our lunch breaks he waa a co worker and he stuttered but i admired his social personality. Like he's always starting conversations with people and no surprise his stutter isn't as much an issue as mines. But he does stutters obviously but just so openly. Im noticing one of the biggest and probably the best way overcoming stuttering is constantly putting yourself out there as scary as that sounds... something i struggle with at least. And not counting at stuttering conventions cuz then I met more. Although i only went once with my stuttering therapist who i haven't seen in 3 years. I should have never left therapy lol.