The line I was referring to when I said Na5 was refuted, which would basically refute the two knights defense, is the line with 8. Bd3. GM Roman Dzindzichashvili thinks this line refutes the variation and has a video about it on this site. And here's a link to site explaining some of the line's.
Learning to play the black side of 1.e4 e5 - a complicated guiocco piano
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obviously.
Great point... until I remember that i'm not a GM :)