Rangers fans were reminded of an increasingly uncomfortable truth in the transfer market this week. As the club reportedly closed in on Levski Sofia centre-back Jose Cordoba, news that the Gers had pulled the plug caught many fans off-guard. Almost overnight, Rangers had gone from a bright start to a monumental transfer window to a very public and disappointing pursuit ending in tears. It’s not the first time that Rangers have missed out on a player – and it won’t be the last – but the situation with Cordoba comes at a nervous juncture at Ibrox. And perhaps it hurts more than normal because En…