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The Tahs do have a few things in their favour:
With Flynn out and the possibility of their reserve hooker being out they might have to dig deep for hookers and with the Tahs lineout on song theyll be able to eliminate that threat of the Crusaders who arent crash hot in the lineout.
Also, while Im yet to be convinced about the merits of the Waratahs scrum, the Crusaders scrum isnt the best of scrums either making probably an even contest. So if the Tahs play well they can go a long way in starving the Crusaders of quality set piece possession.
The two big killers will be the fact that its an away match and that wayward kicking will be punished more so than against many other teams where wayward kicking was the food of the day.