1. PNG - means he had to open it in an editor, then re-save it after editing it.
2. He used a paintbucket to change the bkg from white to grey.
3. At full scale there is artifacts around certain text.
4. Something to check for changes which I don't reveal.
If you want other reasons not related to the image itself:
1. He cropped the full ss, why? it shows editing and hiding of things.
2. Look in the top left corner... It shows the GG connection. Then it shows Query... No channels, so he obviously was only using mirc at that time to make a MoFo chat? How convenient...
3. Why not bring it up when you get the logs? A good time to make some is after you claim you have some.
4. Blah Blah Blah... We can analyze it all day. If you still want to prove its true cokecola, find a GG admin and have them check the logs and tell us...