By that logic, why would the forwards that you like become the top line players you envision? Like it or not, Byram IS projected to be exactly that type of defenseman.
And yet neither one projects close to Byram. Not according to most scouts or other hockey pundits. Again, by that logic one could say that in 15 years, it would not be a shock that Krebs turned out to be better than Cozens, Dach, Turcotte, or Zegras.
Look, your view is your view. But again, most NHL scouts, pundits and HF experts view him as being a top pairing defensive prospect. You need not like him and can like Zegras or Cozens or Turcotte better, fine. But with all due respect, it simply appears like you are stamping your feet and closing your ears and screaming "I don't care. He simply is just not all that". Again, just the way it appears to me.
There is absolutely no logjam at the future top pairing defenseman prospects. None at all.