It's a feature of rugby league (both in England & Australia) that the top-rated referees dominate the end of season play offs. There's no hesitation in appointing in-form officials to sequential games involving the same teams, something which football doesn't appear to consider in domestic leagues or international competitions. Both Chris Kendall & Liam Moore have been impressive this season & others (such as Hicks, Thaler & Child) haven't quite matched them. As for whether Moore would "do the double" having refereed the Challenge Cup Final this season, I reckon Kendall just nicked it because he refereed St Helens v Wigan in an outstanding league match a few weeks ago - both Kendall & Moore appear to have a good rapport with the majority of players. The game should be much closer than either of the SFs & hopefully there'll be no negative mentions of the officials post-match. Gerard Sutton refereed all 3 State of Origin matches in Australia as well as the Grand Final - there are other equally good NRL referees, such as Klein, but if someone is in form then s/he gets the nod. The RL World Cup next year will see similar appointments in the knock-out rounds & if that means appointing an Australian to game(s) involving Australia or an Englishman to game(s) involving England that'll happen.