Rangers captain Barry Ferguson knows all about run-ins with managers at Ibrox. The treble-winning former Rangers captain was never shy of a bit of controversy but his bite on the pitch always backed up his bark off it. Infamously clashing with Paul le Guen and being stripped of the Ibrox captaincy in 2007, there’s also that famous Cameron House clash on Scotland duties in 2009. But between the bust-ups and fist fights, Barry Ferguson’s commitment to the cause at Rangers was never in doubt as he emerged as the best player of his generation in Scotland. The same however cannot be said of wantawa…