As far as Ally McCoist is concerned, one of the players Mick Beale brought to Rangers last summer might just be ‘the club’s best signing in years’. When you consider that the Scottish Premiership challengers did not pay a penny to bring Jack Butland to Ibrox, his contract at Crystal Palace expiring after that loan spell at Manchester United, that only strengthens McCoist’s argument. No goalkeeper in the top-flight has more than Butland’s 17 clean sheets. And without the 31-year-old’s lightning reflexes, it’s hard to imagine that Rangers would have finished top of their Europa League group eith…