Any ideas on how the same guy is at the stadium and then is in the hatch (unless he just looks similar and is not the same guy)?
Did you not watch it? It's the same guy.
I'm not saying he's NOT the same guy, but how did he get to be at both places? IIRC, Jack has not been a doctor for 16 years (unless Jack is in his late 40s), yet the people on the island have been there AT LEAST 16 years. I guess he could have been at the stadium and some how got stuck on the island after that, but that opens up a whole 'nother timeline/storyline.