Hossein Rezazadeh unequal snatch grip

I just came across a video of Hossein Rezazadehs lift at the 2004 Olympics in Athens. I noticed that he takes an unequal grip on the snatch. I also noticed that many times before with other lifters. It is not that easily seen with others as with Hossein. His left hand is more out than the right. And it seems that he does it on purpose.
I really wonder what is the reason for that? How does anyone come up with an unequal grip?

Setup

Pull

Overhead

Overhead 2

Here is the video