But where is the money? Not a single note turned up. That simply means he never spent it so all the theories that he survived with the money are simply not at all likely to be true. If he'd survived and bugged out abroad he'd still have had to spend some of the money to get there and that would very likely have been detected eventually. Had he then lived abroad and spent it (what else would he do with it) some would certaily have turned up eventually. None ever did.
And if he survived with the money why did he drop a bundle into a creek? Possible of course but seems unlikely.
Is it likely he knew enugh about techniques for jumping from 727s to use the "off the stteps" pull? Highly unlikely, and the evidence suggest that doing otherwise would not have had a happy ending.
The balance of probabilities is hugely, vastly in favour of his not surviving the jump.