Since I didnt see anyone else say it...

You are wrong. It can crack WPA2. I've done it. Now i cheated by keeping my dictionary fairly small and using a small simple pass, but it (it being the aircrack suite more than neopwn) passed multiple tests.

Really, monitor mode should be all you need... injection just helps with the deauth... but as someone else mentioned, you really dont act like you know what you are talking about in the quoted post... not hard to capture the WPA2 handshake...