Nope, aggression isn't generally part of any Saints I heard about. I think most aggression comes from habitat and upbringing. It is SO important to socialize and expose your big paw to everything when they are young, can't stress this enough. Its your responsibility, when you choose to own a big paw, that you make SURE you do everything possible to make them an accepted and acceptable part of society.
The real issue is that when a Saint (or any big paw) does become aggressive, they are going to do a world of damage. Being bitten by a toy poodle vs a saint are going to have hugely different impact - even if its the same aggression level. When a Saint bites someone, you hear about it.