And if we knew that then why not trade down? There was demand where a lot of clubs saw it as a 3 man class.
It is a bit disappointing a year after the draft that a ceiling has been established. Now again maybe that ceiling is higher and we are over reacting, but seems unusual for a top pick like that (while not getting an opportunity in the NHL) to fall.
It's easy to say just trade down, but in practice, I can see why it wasn't feasible. This was discussed in a thread shortly after the draft (tried a quick search but couldn't find it right now), but there was an attempt for a 3-way trade between Calgary, Edmonton and CBJ in swapping draft picks.
It was clear that CBJ ranked Matthews and Laine as a tier above everyone else because there was a report about Jarmo exploring trading up in the draft (Toronto and Winnipeg rightfully weren't interested).
But, it's also clear that CBJ had PLD as their firm #3 player in the draft and did not want to trade down if it meant losing him. One of the big speculated reasons the 3-way trade fell apart is that Vancouver also liked PLD and CBJ found out it was likely they were going to take him at 5. So, Columbus did not want to drop to 6 and lose PLD.
That meant the only option is to drop to 4, and there would be no incentive or reason for EDM to do that.
So, Jarmo decided whatever assets he could have gotten by dropping to 6 wasn't worth the difference between PLD and the player that would be left there at 6, so he went ahead and just pulled the trigger on the guy he wanted.
You can argue the decision in hindsight - Tkachuk looks great so far - but I can certainly see based on CBJ's prospect rankings at the time why there was no deal to be made.