Of course mtGox will charge back the money. He has six months to do so. If you spend it, you are on the hook. I would highly suggest leaving it where it is so it goes smoothly for Dwolla.
He is chinese name. If he is in china, you have to spend at least 10k usd to got him.
I do live in China, and if Mtgox cancel my LR withdraw which still in progress, I have to give the money back.