I think he will end up leaving, but I feel it would he would be better served with another year at LSU. So he can work off the kinks, unless he is drafted where he could sit back a few years like Rivers did. He has all the potential in the world if he eliminates the mental errors. Russell has a special kind of leadership, he is a take charge guy.
I hope he wants to go out with an SEC and National Championship; but mark my words, he's gone. He'll be a top 10 draft pick and that kind of money is too hard to turn down, especially when you consider the possbility of an injury that could derail his career.
I don't see how his stock can go much higher if he comes back. From what the draft guru's say he will be the second quarterback drafted.