One of the biggest obstacles in most of the theories on this site is the comeback itself and its quite an obvious problem... the illegality of faking ones death.
Ignoring for a moment the lack of CREDIBLE hoax evidence and the other explanation of faking his death (to dissapear and not to come back). We now find ourselves in an obviously sticky situation... firstly, Michael has faked his death, which on its own is not REALLY illegal. Secondly, the state paid for his funeral, thirdly sales of his music spiked as a result and finally there is an innocent man who has been slandered, put in jail and humiliated for no other reason then to give Michael a scape goat.
Lets say June 25th 2013 is BAM! date (he said we have 4 years and imo this is the most likely date that a bam would occur) he somehow ends up performing live some place and shocking everyone... great show right?! Wrong... he'll be arrested straight away and his comeback will be for nothing. Firstly there's the faking of his death, which on its own would not really be cause for much legal trouble... except the fact that he used it to escape debt, get out of a contract early, put an innocent man behind bars and conspired with other people to keep the hoax hush hush.
Needless to say, there would be alot of unhappy people... particularly his family, who seem to not have a clue about this hoax, as they went to seriously disturbing lengths to challenge his will, which if they knew was redundent anyway, wouldnt have made such a mess of things over it.
No sane person would do this for the sake of entertainment, as the result would be a one way ticket to jail. The only reasonable explanations are he either A. Is not returing (and has harmed numerous people in the process) or is B. Dead (and is a victim of a stupid doctor).