Celtic had just come off a gruelling and emotional Champions League trip. So, in that sense, you probably expected Brendan Rodgers and his players to endure a difficult, nervy and probably close game against Motherwell at Fir Park days later. But, as the clock was ticking towards the full-time whistle, Celtic were running out as comfortable 3-0 winners over Motherwell and returning to the top of the Premiership table. Even with captain Callum McGregor out injured, the Bhoys still did the job, with goals from Luke McCowan, Alistair Johnston and substitute Adam Idah. Unlike last season, the cham…