Chychrun is getting the same treatment as Crouse last year. They didn't put up the offensive numbers that were expected, they get hated on throughout the season, and picked apart for every little thing they do. Then a flashy new toy like Sergachev comes along and does put up the offensive numbers despite other shortcomings, but the onlookers only see the good, and don't pick them apart for the not so good, and voila...
Fact of the matter is that Chychrun is a rock solid defender. He is 18 years old and makes mistakes just like every other 18 year old. He has the work ethic, character, skating ability, shot and physicality to be a high end NHL defenseman. Watch any #1 NHL defenseman, especially the Doughty's and Subban's of the world. They make many mistakes throughout the game, usually from trying to be overly aggressive offensively, and forcing plays. The thing is, that their effort and skating level is so high that they can make up for their mistakes. That's what Chychrun has too.
Just my 2 cents, but Chychrun remains number 3 on my board, and is unquestionably the best defender in this draft in my opinion.