I think Roy's contribution to endangering the outcome of the series is possibly overstated, considering so far we have just two players averaging over 30 with the bat!
Listening to Stuart Broad on the Broad & Fry podcast today, he was saying what an important character Roy is in the dressing room and what a close knit group it is, so I suspect that comes into it too.
Like you guys, I think Roy may well fail to adjust to test cricket, but training him up as a test opener against arguably the best bowling attack in the world was always more likely to fail than succeed and was a huge ask of Roy. It's a gamble taken because of Roy's sheer destructive power and class as a one day player, and I think a gamble worth taking, but he should be much more suited to #4. Fingers crossed he gets a hundred at Old Trafford!