The cast of characters assembled but the show did not go on. Billionaire John Magnier, spotted outside the Four Courts in a John Deere baseball cap, sat at the back of Court 11 flanked on the left by 50 Arthur Cox lever arch files. Bookending the stack was Eugene McCague, Magnier’s sometime advisor and the retired managing partner of the top-five law firm engaged to act for the bloodstock tycoon. Magnier’s entourage included a PR executive and the businessman’s son-in-law and co-plaintiff David Wachman, the retired racehorse trainer. Feet away were Richard and Anna Thomson Moore, ancestral owners of the…