Maybe we finally get either a big red herring, or John Doe is getting a bit closer to the truth of his origins. It appears that underneath his chest scar/symbol is a metal device that caused a MRI machine to mal-function (as a test to see if John was from the future - hee hee). John is now having blackouts (my guess it is from his device getting zapped by the MRI e-mag) which give him glimpses of a past life, but nothing concrete. He may have tracked down his real father (who supposedly died in a car explostion) and his real mother, who was found buried in a container that was discovered while construction crew was prepping an area which could have been the home of his father's. You have to also think that the device in John's chest has to help him get all the facts at his disposal in a split second, like the ultimate PDA, only implanted with a direct link to his brain. It could also help him make logical deductions given certain amounts of data to help him solve problems. Horseshoe Island may be the place where John was "created". If he were given up for adoption, a secret agency needed "human material" for their projects could have gotten John as an adoptee. I also have to think that Digger might have a bigger role later down the line, he might be a mole that's keeping tabs on John Doe. I just can't see casting William Forsythe in the role of Digger just so he can collect a paycheck for serving drinks and relaying stories about his ex-wife.