How much of a disruptor is Koike in Japanese politics?

When Yuriko Koike split from the Liberal Democratic Party in May 2017, 10 months after she had been elected governor of Tokyo, Prime Minister Shinzo Abe could have been forgiven for assuming that she could be relied upon to support the national government in at least some policy areas.
After all, she had served with the LDP for 15 years, held three cabinet portfolios – including that of minister of defence under Abe – and is widely thought to hold conservative views similar to the…