It doesn't really hold water for me and frankly, I find it to be a disingenuous argument. Considering there's usually 12 forwards and 3 RHD on each team, the ratio is... let me check the math... just about right.
Then it becomes a debate of quality Vs quantity. There's a strong argument that all three of the RHD prospects could become NHLers, depending on how things go. But around half of the forwards listed won't be. If you take out the first 6 listed, Caufield-Suzuki-Dach-Slafkovsky-Newhook-RHP, which of the remaining guys are you convinced, without a doubt, that they're NHLers? The only one I have no doubts about is Beck. And of all those players listed, Michkov is better than all of 'em.