Former Derby County striker Malcolm Christie has not been convinced by the arrival of Corey Blackett-Taylor. Captured for £300,000 from League One rivals Charlton Athletic in the January transfer window, Paul Warne anticipated Corey Blackett-Taylor being the final piece in Derby’s promotion puzzle. The powerful winger had produced stunning numbers for the Addicks in the first half of the campaign, including eight goals and seven assists in 25 appearances. In a side with better quality players and one fighting towards the top end of the table, the 26-year-old was expected to flourish in Warne’s…