IOTL, the Prussian Otto van Bismarck united all of Germany except for Austria, which he left alone because Austria was the only German kingdom that could rival Prussia. What if instead of a Prussian annexing other countries, it was an Austrian, and this Austrian decided to leave Prussia alone? Is this feasible? Would it require a pretty early POD? What would the consequences of this unification be for the future of Germany into the 20th century?