It would probably help if he bowls a decent amount for Victoria too. Suffering from a severe lack of overs, is White. As I've pointed out, a bloke like Andy Symonds bowled more overs last year in fewer matches than White did.
Easy. In Delhi, Kumble wins India matches so Mishra should miss out. Sucks for him but he's only 25, plenty of time for him to cement a place after Kumble is gone. Probably depends on how well he bowls in the second dig too. Yes he ran through the Aussies and did bowl well but how much of that is because he was an unknown quantity? Can you guarantee he'll have the same effect in the next innings or next Test? His overuse of the wrong'un might count against him now the Aussies knows how much he uses it; not as if it's unpickable. Don't think someone can fluke a 5-fer on debut purely because he's an unknown quantity?
http://content-aus.cricinfo.com/statsguru/engine/match/63866.html
This is assuming Kumble is fit too. I get the feeling he's been carrying for a while now. If he's still unfit then, sure, keep Mishra.