Dani
Air China span a 747 in a well documented incident off the coast of California.
Dai Davies talks extensively about risk of spinning large gets in 'Handling Tne Big Jets' which is regarded by most as the seminal work on large aircraft handling. If Dai Davies thinks there is enough spin risk to warrant writing about prevention and recovery then I suggest the risk is real.
Or are you prepared to tell us all that you think Dai Davies got it wrong?