Rangers have been told they could live to regret not signing Lawrence Shankland or Bojan Miovski with Cyriel Dessers maybe too inconsistent to be relied upon in a Scottish Premiership title race. After a sudden burst of form either side of Christmas, last week’s 2-1 win over Aberdeen was a return to the mean. Cyriel Dessers, clinical in previous outings, was back to snatching at chances, wasteful and wayward as Rangers made very hard work of Neil Warnock’s deep-lying Dons. Despite the undoubted improvements in his game since Philippe Clement replaced Mick Beale in the Ibrox dugout, Dessers sti…