But he is. See, Cook and Cook, you get that horrible, stodgy prop on the front foot and a batting style which looks like a baby giraffe trying to take his first steps. And they'll average, what 90 plus runs for you per innings added together. Bradman gets that himself, and frees you up to pick, say one Cook instead of having to pick two, which let's face it is an awful thing to contemplate.
Imagine if you had to pick two Warners. There couldn't be that much room on one team for two such massive amounts of bravado. The team would collapse in on itself under the weight of so much misplaced hubris. It would be awful. You'd have two blokes slog wildly at spinners, hit the ball straight up in the air and walk off shaking their head like they can't believe it actually happened. It would be very bad.
Likewise, you couldn't have two Tendulkars, because even if they made two Tendulkars, there's only one number 4 spot in the batting order, and one of the Tendulkars would have to run off and cry because he couldn't bat there. It wouldn't be good for team harmony.
You couldn't pick two of the One True AB, either, Mainly because there's only One True AB, so that ends the argument.