This is a free preview of a paid episode. To hear more, visit thecelticunderground.substack.comIt was the oddest of odd seasons. 50,000 supporters bought season books for games they never saw in person. Instead logging on to Celtic TV to watch games that were instantly forgettable as the players struggled to perform in empty stadia. Covid tests, social distancing rules and punishments that seemed to change with the wind in a season where mira…