There is a tosa breeder in USA, STONEWALL, that takes their dogs to schutczund training (defense), so I would not precipitates to give an absolute answer about the complete lacking of defensive drive and ability from tosas. I think that Tosas would protect and akitas too. When you search for the history of the akita inu breed, you will find that in the past, they were used for watching and defending the babies in the houses of Japan, so their mothers could make home duties. And I have seen a lot of Akitas people haters and aloof...