The phrase ‘necessary evil’ comes to mind as Rangers open talks to bring another of their leading summer targets to Ibrox. RC Lens Oscar Cortes has already returned for a second spell at Ibrox, this time with a £4 million obligation-to-buy clause in his contract. That came days after a deal was finally rubber-stamped for long-time left-back target Jefte Vital. And signing number three, if it is indeed going to be a certain £5 million man, could be the most exciting made by any club in Scotland between now and September. According to reports – and despite a bid arriving from the Czech Republic …