With Rangers’ grip on top spot on the line, Jack Butland sent a message to England manager Gareth Southgate with a wonder save in Kilmarnock. The Gers went into the interval 1-0 down at Rugby Park and it was an uncertain evening for the club against Derek McInnes’ stubborn and disciplined Kilmarnock team. Rangers struggled to settle against Killie, who were good value for their lead, and Butland has since revealed a stirring half-time reminder refocused Rangers’ aims at the break. But if the goalkeeper hadn’t made a wonder stop to halt Kilmarnock’s Marley Watkins just moments into the second p…