Celtic fans will have mixed feelings over how the January transfer window panned out as they turn their attention to the Scottish Premiership title hunt. Nicolas Kuhn and Adam Idah have arrived at Parkhead, which will give Brendan Rodgers some flexibility across the front three positions heading into the second half of the campaign. Despite this, the overriding feeling among many is frustration as the Hoops missed out on bringing a left-back amid reports the position was a key priority for the manager to strengthen. On the flip side, there has also been movement in Rodgers’ quest to trim the s…