Celtic are playing so well that there are even Lionel Messi comparisons flying about now. Everyone witnessed Brendan Rodgers’ utter dominance in his first spell as Celtic manager and then Ange Postecoglou, at that very least, matched it when he was in charge. It could even be argued that Postecoglou’s Celtic played the better football, with Tottenham fans now enjoying his all-action style. But this current Rodgers side, which put six goals past St Johnstone on Saturday evening, is playing football of the highest order. Some of the goals Celtic are scoring are incredible and many are starting t…