Rangers striker Cyriel Dessers might’ve netted a deadly double v Dundee but it still might not be enough to silence the doubters. The 29-year-old Nigerian international has blown hot and cold in Scotland since moving to Rangers last summer but was the man of the moment on the club’s return to Ibrox. Netting two goals and winning a James Tavernier penalty in the 3-0 win over the Dee, it was a commanding performance by Cyriel Dessers in Glasgow’s southside. But despite the striker netting his sixth and seventh goals of a productive season to date, Dessers still had to answer questions on the gro…