Well, that email inbox is his, I checked it out, so that's not fake. A search of the email Okiver is "supposed" to have used turned up this:
http://webcache.googleusercontent.com/search?q=cache:QOWj_NYVfD0J:www.hackforums.net/showthread.php%3Fpid%3D25034655+&cd=4&hl=en&ct=clnk&gl=us Go to post #23.
Another interesting thing I found under the UDP Unicorn reviews:
hammereditor
I love this program! I manage a game server hosting organization, and I wanted to test the security of my service against DoS and DDoS attacks. I downloaded this, and managed to triple the ping/latency of a connection to one of my game servers. It normallyhas 140ms ping, but I made it go up to 420! Plus, the game client starts to warp the display once the ping gets higher than 440ms. This causes indirect lag! The trick was to create 2 KB-size packets, but use a lot of sockets and threads. In essence, I parallelized all the requests. And playing the geek song makes you happier!
That was posted 8/18/13. I'm not going to post a direct link to it since you can also download the program from there, but if you find the page the review is right on top.
Honestly, the way I see it this thing can go three different ways. #1, Hammer did DoS RTB and had Okiver send him that email so he could get evidence of his "innocence", #2, Hammer did the DoS and made up the evidence saying that Okiver did it, and #3, Hammer didn't do the DoS but Okiver did and is framing Hammer by using his IP address.
Edit: I just noticed something, in the first photo it says it was received at 1:34PM, but the photo of the message itself says 4:34PM?