This question is a bit old, but in my experience fixing the classic iPhone 5 battery replacement pry damage every day, I've seen one or two phones that don't have the classic iPhone 5 pry damage, but do have pry damage *just* to the tiny resistor next to the U3 chip. This little guy is required for home button function only. In those cases, replacement of that resistor solved the home button problem. Of course this is very unusual---only a possibility if shorting of the two gold contacts on the lightning connector does not activate the home button.
jessa