All it shows is that Ryback can do the unthinkable.
It was impossible for him to get over with months of squashing jobbers and he did it.
It was impossible for him to Shellshock Mark Henry and he did it.
It was impossible for him to cut a good promo and he did it.
Discredit him all you want because it was taped but if they had to go with the best takes and that's what they got, then it proves he can cut promos. Of course, doing it live gives a bigger impact but hey, if the club's in the bag for him to cut promos at that level, then I don't see why with just a little bit of work, he can't do it live.