Former player/manager believes it is too early to judge Derek McInnes’ revamped Rangers squsd Graeme Souness knows exactly what is required to be a successful Rangers manager. No one is better qualified.The relentless demands placed upon you by fans and the board who expect to win trophies and for the team to produce high-level performances each week. The intense scrutiny that follows every decision, win, or loss is magnified. And surviving the Old Firm crucible by winning derby matches against Celtic, which can often define a legacy. Three major factors that go a long way towards defining any manager who takes the reins at either of Glasgow’s ‘big two’. Then comes your understanding of the club, building a steely resilience and having a no-nonsense authority. New Rangers manager Derek McInnes will find the pressure at Ibrox extremely intense, according to Graeme Souness…