1st off, honorable mention to Gilbert Brule, this is more on Dougie Mac for allegedly not listening to any of his scouts, but lets do a deep dive.
Lets look at players you listed.
Picard: 2 points for the Jackets. Traded for Chad Kolarik (career minor leaguer)
Filatov: 13 points for the Jackets. Traded for pick that turned into T.J Tynan (career minor leaguer)
Moore: 8 points for the Jackets. Traded in a package for Marián Gáborík (we know who he is)
Rychel: 11 points of the Jackets. Traded for Scott Harrington (solid 7th d-man for the Jackets)
Dano: 21 points for the Jackets. Traded in a package for Brandon Saad (we know who he is)
Carlsson: 16 points for Jackets. Lost via free agency
Foudy: 10 points for the Jackets. Still with the club.
Its down to Picard and Carlsson for me. I always wondered if Carlsson would have a better fate if he didn't play for the CBJ during thier greatest period of defensemen ever, but he did play during that period and he didn't develop. Yes the CBJ got nothing for him, but I will have to go with Picard.
Not only did he get a whopping 2 NHL points, half of what Pascal Leclaire got, and he was a goalie, its the lowest point total by any CBJ 1st round pick who has played for the club not named David Jiříček (he gets a pass for obvious reason.) But, once again going back to Dougie Mac, if Dougie was smart enough to trade this bust when he was just a prospect, the Jackets would have landed Chris Pronger.