For example, take a look at these two shots:

The odds of this being a "photoshop" are significantly reduced due to the issue of there being multiple shots...would they photoshop multiple images? Most likely, not.
But the question still remains is that the image of MJ in the ambulance looks nothing like the 2009 Michael Jackson. In fact, it looks more like Navi without makeup in 2009:

I'm not implying it WAS Navi or one of the "doubles" in the ambulance, but you have to admit that he makes a better fit than the 2009 MJ:

Note that it was Navi who admits to have gotten a call to do some "visuals" for This Is It, and he's worked as a decoy but "can't talk about it" (start at 1:23):
If anything, this serves to make anyone wonder - who really was it in the ambulance in June 2009? Someone with darker skin than MJ in 2009...there are many possibilities; only one is the truth.