James Tavernier went through all the emotions of being Rangers captain in 90 minutes against Celtic. But that’s probably a good way to sum up the 32-year-old right-back’s nine years in Glasgow. There have been some extraordinary highs for British football’s greatest ever defensive goalscorer (132) but also some crippling lows. Celtic – against whom Tavernier now has six goals – have always proven a difficult adversary with the Rangers captain’s journey against our Old Firm rivals almost a mirror image of the club’s. And in that vein, against Celtic once again James Tavernier was central to the…