I dont understand why i would need to have the 16 BTC on mtgox, and you have not even disclosed how much you got those BTC for.
Simply all you are trying to say is fund btc-e account buy btc for cheap and sell on mtgox.
Nothing new there, and you have neither mentioned all the fees and more importantly time involved
This post is only for people wanting to know how to make additional money whenever they are going to sell their BTC anyway. They are not buying BTC to sell.
You would put the coins you want to sell on whatever exchange has the highest price, MtGox in this example.
Yes, this is a simple buy low, sell high move.
What is new is the order of doing the steps to end up with the extra money without paying any conversion fees and without ending up with unmovable money or BTC in any of the accounts.