About a fortnight ago, Rangers’ rampant form under Philippe Clement had few believing that even Celtic could catch them this season. It is easy to get carried away when a team is rising into the apex of a good spell and – with Rangers still competing on four fronts – talk of a quadruple was rife. But after defeat to Motherwell in the Scottish Premiership, a Europa League exit at the hands of Benfica, and a frustrating Dens Park call-off, that good feeling has been replaced with a sense of confusion. There’s a sentiment too that Celtic – after manager Brendan Rodgers had cut a flustered figure …