Just wanted to answer the question from Reader Mail (I just emailed this to T-Mag but figured I might as well just post it)
Gregg had an absess in that bicep a few years ago and those pictures are from after the surgery. If you look at the pictures of his arms you will notice that one bicep does not have a 'peak', that is the one that was operated on.
How do I know this? I designed and coded the website that those pictures were taken from - www.GreggValentino.net - so I talk to him quite frequently.