Erm, because he is (and will only get better, whereas Compton is, with the best will in the world, at his peak right now). There are lies, damn lies, and opportunely selected batting averages. I don't really think after three or ten knocks you can place too much store anyway, but to use it with an ongoing 100* is a bit cheeky....So how has Compton done? Well enough that he deserves to stay in the side (though I'll be honest, I reckon he was pretty close to last chance saloon after that first innings duck) - but I don't think you can compare the composure under pressure and in both adverse and alien conditions that Root showed on debut in India with Compton grinding out a ton against a mediocre attack (and thats mediocre on a good day) on a shirtfront. This is my concern about his first class record of the last 18 months - runs at Taunton tend to be, erm, a little cheap given the batting friendly combination of small boundaries, quick outfield and wickets of motorway-like character. I've seen Root make brilliant scores in horrid conditions - his double ton against Hants last year (out of just over 300) on a minefield was an innings that I can't ever see Compton matching.