I personally think Michaels numerous nose jobs were down to his obsession and his insecurity over his looks. He had inner demons that he was fighting and these manifested themselves in plastic surgery. He was trying to change a percieved imperfection.. and when he changed it, he still wasnt satisfied so he kept going...
I dont think it was part of any plan. It was Michaels inner vulnerability, insecurities and demons that drove that one.
By the way... i think its harder to make a nose bigger than it is to make it smaller. In order to make something bigger, you have to add cartilage, fat and skin.. easier to take that away to make something smaller than to add it and make it bigger.
Dr Klein said that is what he was doing during TII period,.. he was using fillers to plump out MJs nose and make it appear more natural as, sadly, so many surgeries and rogue plastic surgeons had destroyed MJs nose.