Top Prospect for top prospect trades rarely work on here and even IRL because teams and fans generally think their prospects are better than they actually are.
I personally don't think that's it. I think they rarely work on here for the same reason they rarely happen in real life. Teams draft a guy because the guy has certain qualities that appeal to them. That rarely changes in 1 year and especially, in a case like Connor and Aho, when they do even better in their draft+1 year, there is no incentive to try to move 1 prospect for another in a lateral move. They want to see how they will develop further.
Down the road, once a team then puts in the time and effort to develop said player, they further don't want to trade a guy that they've invested in unless it fills a different need (ie..trading a forward for defense, acquiring a veteran guy to put them over the hump, etc...) or there are "other" issues.
Connor for Aho right now really doesn't serve a purpose for either team IMO.
EDIT: Credit to the OP though. I've been waiting for an Aho to WPG or Aho to CLB proposal and fully expected either a lesser prospect and some later draft picks -OR- and older player to be the offered return. At least you made a fair proposal, value-wise.