OK Alstom_888m, let's have a look at your named players.de Villiers -
has batted higher up the order, and now bats at 5 because he is also the wicketkeeper; he needs a bit of a spell after coming off after fielding.Kallis
- a genuine allrounder ( the second best after Sobers ) - also gets a spell after he's been bowling.
In the case of these two, even when batting first, sensible captaincy would keep a settled batting order.Tendulkar
- had Dravid at 3.Smith
- an opener.Jayawardene
- has moved around the order as well - why he isn't at 3 I couldn't guess.Hayden
- an opener.Hussey
- Ponting, the side's best batsman and captain, was at 3.Cook
- an opener.Pietersen
- far too flighty for 3, and not necessarily his side's best batsman anyway.
The best no 3 batsmen, to take Australia as an example, worked their way up from no 5 or 6 - Bradman, Hassett, Miller, Harvey, Ian Chappell, Boon, Ponting. Each was the side's best when he took over at 3. Clarke has put very inexperienced players ahead of himself, and his message is clear, "Even with my great experience, I can't handle it, so you go up there and protect me." If he had a test class no 3; OK, stay down at 4, but he doesn't have one. Doolan's skill set is a Sheffield Shield no 3 - not a test 3. There's a very big difference. Clarke at 4 or 5 is a cop out - pure and simple.