= about 20% use the belt-and-suspenders approach. If that means they're doing two different things for the same site at the same time, isn't that liable to make someone mad? At best, you end up with conflicting advice and then what do you do, bring in a third person?
Yes, the use of SEO in the Japanese market is often a haphazard affair, usually added as an afterthought, and often neglected after implementation. It's very possible the survey respondents were indeed using different things for the same site at the same time on their sites. I would not be surprised at all.