When Nils Koppen came into Rangers, there was plenty of transfer talk about emerging markets. The appointment of Koppen, who had established himself at PSV, is viewed as a step towards a more active and aggressive approach to player trading and transfers. The Ibrox side’s chairman John Bennett – in words which he will be judged by come the end of his tenure at the top of the club – claimed the so-called “fourth pillar” would be getting fortified on his watch. Until now, but for a few reinforced deadbolts left behind by the sales of Nathan Patterson and Calvin Bassey, it had shown signs of deca…