Another thing to keep in mind is that there is no Millenium stadium in Japan. Wales more than any other nation have made their home stadium a fortress and playing at home seems to give them an extra 30%. Wales three away performances in this year's 6N were far from convincing. France's second half capitulation gifted them a win, unconvincing against Italy and very fortunate not to receive multiple yellow cards against Scotland in the second half which could have led to a different result. For me, the three crucial factors to Wales's success are 1. Gatland (& Edwards), 2. Millenium stadium and 3. AWJ as captain.