When Nils Koppen came into Rangers from PSV Eindhoven, the Belgian did so with a clear transfer mandate. At the release of the club’s latest accounts, chairman John Bennett was clear that a more aggressive player trading model would be essential to cut operating losses. The ‘fourth pillar’ of the club’s business model hasn’t so much been a reinforced structure in recent seasons as it has been a shoogly peg on which our financial hopes have been precariously balanced. Rangers have had success in this department, namely Nathan Patterson, Joe Aribo and Calvin Bassey, but there have been too many …