Firstly the last part of this post is just a straight up lie. Barzal is a player many of us rated very highly over the summer...which is why we were willing to forget about the defensive piece if Barzal was on the table for Duchene.
Next let's take a look at these offer so maybe you can understand why the Duchene trade that did happen was much more valuable to colorado than this proposal. You are suggesting 2 firsts, 2 seconds & MDC; instead of the 1st, 2nd, 3rd, Girard, Bowers and Kamenev that the avs did get for duchene. After washing out a 1st & 2nd...which, given where Ottawa's 1st looks like it will be, is very kind to the Isles package...that means you are trying to argue that a 1st, 2nd & MDC is even close to Girard, Bowers, Kamenev & a 3rd. Which is just silly, I wouldn't give up Girard alone for that.
So yeah, if you really think that Isles package isn't all that far off from what Sakic did get, then you are either delusional or ignorant. And I leave that choice to you.