|Staggered grip=a grip that won't fail on a max pull.|
|Pretty sweet drawing I found of Mount Doom. Inside, there is a chasm, and it is the only one that can destroy the precious.|
One of the reasons I think it allows more weight is because it is easy to engage the lat muscles--it's easier to break a stick, bend a piece of metal, or "break the bar" for a bench press or deadlift when you have a pronated grip.
Recently, I was deadlifting with a pronated grip, and since I am still practicing it and am new to it, my grip started to go, and I switched to a staggered grip. Immediately, I felt weaker. The reason being is because I couldn't engage my lats well enough to do anything. As I said earlier, if the grip is staggered, it's harder to bend the bar.
This last nuance I stumbled upon myself, and it overcomes the lack of lat involved in a staggered grip: when using the staggered grip, squeeze the shit out of the bar and try to move your hands closer together. The friction will not allow it, your lats will be engaged, and you will feel stronger.