You have an overly optimistic view of that draft and our prospects in general. The reality is, you are extremely, extremely lucky if 2 or even 3 prospects hit and become NHL'ers from the same draft. Countless teams year after year draft promising players only to find that the guy they took in the 5th or 6th round becomes a bottom 6 player while everyone else busts. I would love for all the things to happen that you are saying, but the reality is that is highly unlikely.
Janko is not playing at a PPG pace, he hasn't shown anything to suggest he will bust per se, but he also hasn't shown us anything to say he will be more than a Joe Colborne. Sieloff has a very low bust factor, I would bet money on that he will be in the NHL and probably by next season if he can get his conditioning back up. Gillies has been fantastic and one of our top prospects, but goalies really are very hard to predict. We won't know what we have with him until and if he ever plays in the NHL. Culkin and Kulak have progressed nicely, but every NHL team has those guys. If one is going to make the NHL, they really need to take a huge step in their game and dominate at the AHL level when they turn pro.
I would very shocked if Gordon or Deblouw ever see the NHL. Gordon is a good kid, his skillset isn't high enough to be a top 6 player, and from the couple times I've seen him he isn't physical enough to be a bottom 6 player. I could be wrong, I hope I am, but I haven't seen enough factors in him where I can say, he will be in the NHL some day. Of course, lots of guys are late bloomers and work extremely hard, those are the guys that surprise. I feel Culkin is like that, so I think he may make it.