Except, no. Tokugawa Yoshinobu wasn't some kind of backwards traditionalist, he was as much a modernist as the people in the Meiji government in a lot of ways.Shogun wins the Boshin wars, or worse, they become a stalemate, or longer war.
Saigo Takamori rather than beseiging Kumamoto castle, bypasses it, and advances, staying one step ahead of the Imperial Army. He makes it to Edo, where he 'interogates' the Meiji government, leading to many executions.